Art. XVIII.–New Zealand Crustacea, with Descriptions of New Species.

By George M. Thomson.

I would here desire to express my thanks to Professor Hutton for the great assistance he has given me, and particularly for handing over for my inspection the collection of Crustacea in the Otago Museum, together with his own valuable notes and manuscript descriptions.

Decapoda macroura.
Sub-tribe Caridea. Fam. I. Crangonidae.
Crangon, Fabricius.

Internal antennæ dilated at the base, the peduncle short, and terminated by two filaments. External maxillipeds pediform, the terminal joint obtuse and flattened. Anterior legs sub-didactyle, stronger and thicker than the others; the hand flattened, the moveable finger inflexed upon the hand, and meeting a rudimentary thumb; second and third pairs very slender, the second didactyle; two last pairs shorter and thicker. Abdomen large and rounded.

1. Crangon australis, Hutton, MS. Cat. Fig. A.1.

Carapace with five longitudinal rows of spines, the outer with three from the base of the moveable plate, the next with five from the outer margin of the orbit, and the median with two. Moveable plate extending beyond the peduncle of the outer antennæ. Inner antennæ short, hardly passing the external maxillipeds. Anterior legs extending beyond the tip of the moveable plate; second pair about half the length of the first; the third much longer. Abdomen smooth, not keeled, suddenly contracted at the second and third segments from the end, posterior segment nearly cylindrical. Length 1½ inches. Common.

Cook Straits, Dunedin, and Stewart Island. (Allied to C. spinosus, of Britain).

Palæmon.
Sub-genus Leander, Miers' Cat., p. 85.

2. Leander fluviatilis, nov. sp. Fig. A.2.

palæmon fluviatilis, Hutton, MS. Cat.

Beak narrow, slender, nearly straight, with from nine to fifteen teeth on the upper margin, which are more or less separated into three groups, the posterior of which consists of two, or rarely three, situated behind the orbit; the middle of four to six, in front of the orbit; and the anterior of three to six, much smaller and situated near the apex; four to six teeth on the lower margin. Anterior margin of carapace with one spine, and another over the inner angle of the orbit. Anterior feet short, but rather stout, reaching to the end of the peduncle of the outer antennæ; second pair very slender, longer, but not reaching to the tip of the moveable plate. Length 1½ inch.

Waikato River (Professor F. W. Hutton); Taieri River, and lagoons in Taieri plain.

Edriophthalmata.
Tribe I.–Isopoda.
Sub-tribe I. Idoteidea. Genus Idotea.

Idotea affinis, Miers' Cat., p. 93.

In the description given of this species the flagellum of the antennæ is said to be about 20-jointed, and the length 1¾ inch. The species is said also to “vary slightly in the number of the joints of the external antennæ.”

In a great number examined by me, I found the length to vary from 1 inch to over 2½ inches, and the number of joints in the flagellum from sixteen up to thirty-two.

Sub-tribe II. Oniscoidea.
Fam. II. Oniscidæ. Miers' Cat., p. 98.
Sub-Fam. I. Oniscinæ. Genus Oniscus.

3. Oniscus punctatus, nov. sp. Fig. A.3.

Body rather convex, oval, minutely granulated over the entire surface. Head short and broad; eyes small, round and black. Antennæ finely hirsute, fifth joint the longest, equalling the last three. First segment of thorax wider than those succeeding; last segment produced acutely backwards. Abdomen not much narrower than thorax, but falling away rather abruptly; two anterior segments narrower than the others, and not produced into exserted lateral angles; three succeeding segments subequal, with their latero-posterior margins acutely produced; last segment short and rounded. Caudal stylets short, external branch the longest, narrowcylindrical, minutely hirsute, with two or three short setæ at the extremities.

Colour light brown, with darker markings. Length 3 inch.

Dunedin.

Sub-Fam. III. Ligiinæ.
Genus Ligia, Miers' Cat., p. 103.

4. Ligia quadrata, Hutton, MS. Cat. Fig. A.4.

Oval, sub-depressed, with minute granulations on the back, but free from hairs. Three posterior segments of thorax acutely prolonged backwards on either side. Abdomen considerably narrower than thorax, last segment sub-quadrate, the angles hardly projecting. Outer antennæ two-thirds the length of the animal, fourth and fifth joints much the longest; flagellum from 15-to 23-jointed, minutely setose. Base of caudal stylets about half as long as abdomen; rami slightly unequal, shorter branch with a long slender seta, which reaches beyond the extremity of the longer branch. Colour yellowish-olivaceous closely speckled with black. Length .5 inch.

Dunedin.

This species lives among loose stones on the beach, and runs with great rapidity.

Sub-tribe III. Cymothoidea.
Fam. I. Cymothoidæ.
Genus Ceratothoa, Miers' Cat., p. 104.

5. Ceratothoa trigonocephala.

Cymothoa trigonocephala, M. Edw. Hist. Nat. Crust., iii., p. 272.

Head small, triangular, having the antero-lateral margins very concave above the antennæ, and the front narrow but obtuse, and projecting a little beyond the base of the inner antennæ. Eyes very distinct. Outer antennæ considerably longer than the inner. Anterior margin of the first thoracic segment produced a little at the corner upon the head so as to give rise to a tooth upon the median line; antero-lateral prolongations of medium size, narrowing in front, but rounded and not reaching to the base of the outer antennæ. First segment of the abdomen about a third less than the second, which exceeds on each side the margin of the last thoracic segment. Posterior margin of the fifth segment very sinuous, and presenting a deep, median indentation. Sixth segment large, but gradually narrowing from the base, rounded posteriorly, and not nearly so far extended as the terminal plates of the lateral appendages. Length 1.6 inch. (My specimens are about 1 inch long).

Dunedin.

This species is also found in the Australian and Chinese Seas.

Fam. III. Sphœromidæ. Miers' Cat., p. 109.
Genus Amphoroidea, M. Edw., Hist. Nat. Crust., iii., p. 222.

Body convex, somewhat oval and flexible. Head quadrilateral, broader than long; eyes small, occupying the lateral margin; anterior margin of the head with five small teeth. Basal joint of inner antennæ very large, lamellate, quadrilateral, broader in front than behind, horizontal, and in contact with its fellow; second joint small, inserted at the side of the first, near its posterior angle; the rest almost moniliform. Outer antennæ inserted under the inner and directed forwards; the peduncle cylindrical, terminal joint longer than that of the inner antennæ. Abdomen broader than thorax; last joint large, scutiform and deeply excavated below.

6. Amphoroidea falcifer, Hutton, MS. Cat. Fig. A.5.

Smooth, sub-depressed, rounded on the back. Head broader than long, the anterior margin three-lobed, the middle one pointed and acute; lateral margins hollowed; posterior margin straight, sub-sinuated, produced posteriorly on either side into a truncated lobe. Basal joint of inner antennæ longer than broad, the anterior margin convex, the outer side straight, the posterior side bilobed, fitting into the lobes of the head. Outer antennæ reaching to the middle of the third thoracic segment. Last segment of the tail triangular, bidentate at the tip. Outer ramus of

appendages long, projecting considerably beyond the tail, falciform, acute, curved inwards; the inner much shorter, sub-rectangular, longer than broad, truncated at the apex. Claws short, subequal, hooked. Reddish brown. Length .6 inch. Kaikoura Harbour and Stewart Island.

Note.–Since writing the foregoing description, I have seen, through favour of Dr. Haast, the Atlas of the Crustacea described by Dana in the Zoology of the U.S. Exploring Expedition. From the figures alone (not having been able to obtain a description), I think that this species may prove to be identical with A. australiensis, Dana.

Genus Cymodocea, Miers' Cat., p. 113.
Sub-genus Dynamena, Leach, Dict. Sc. Nat., t. 12., p. 343.

Terminal segment of the abdomen simply notched, but without a median lobe. Rami of caudal appendages lamellate, as in Sphœroma.

7. Dynamena huttoni, nov. sp. Fig. A.6.

Moderately convex, nearly smooth, marked with numerous minute granulations. Head small, twice as broad as long, with small obtuse frontal lobe. Segments of thorax subequal, the three last slightly produced backward at their infero-posterior margins, the last with a slightly rounded lobe, just overlapping the edge of the abdomen. First segment of abdomen with four lines of articulation, the last of which has a tooth on each side on its posterior margin. Last segment triangular, swollen above, ending in two short acute teeth, with a rounded sinus between them. Rami of caudal lamellæ equal, oval-oblong, obtuse. Orange-yellow colour. Length .5 inch.

Dunedin.

I have named this species after Professor Hutton who collected it.

Genus Nesea, M. Edw., Hist. Nat. Crust., iii., p. 216.

Body not very flexible, and incapable of being rolled into a ball. External ramus of the caudal lamellæ projecting, thick and rounded, incapable of being folded beneath the inner. Inner rami united to the inferior margin of the abdomen and carried transversely underneath it, so as to be easily mistaken for it.

8. Nesea caniculata, nov. sp. Fig. A.7.

Body very convex; roughly granulated, particularly towards the abdomen. Head prominently rounded. Eyes black, triangular, received into a deep indentation in the margin of the first thoracic segment; an intra-marginal groove extending between the eyes round the front of the head. Frontal lobe small, obtuse. Basal joint of inner antennæ large, and adhering rigidly to the head, second joint short and rounded, third slender. Outer

antennæ springing from underneath the base of the inner, half as long again, and slender. Segments of the thorax directed backwards at their posterolateral margins; first segment broader than others; succeeding segments subequal, each with a flattened granulated ridge on its posterior margin, giving the back a transversely grooved appearance. First segment of abdomen produced posteriorly into a flattened truncate expansion, with a slight median indentation; last segment placed almost underneath the former, triangular in shape, with a pyramidal tubercle on each side, its apex united to the internal rami of the caudal lamellæ. External rami thick, angular, and two-jointed. Legs fringed on their inferior margins with short, thick hair. Colour dark brown. Length .6 inch.

Dunedin.

Collected by Prof. Hutton.

Tribe III.–Amphipoda.
Division Normalia. Family I. Orchestidæ.
Talitrus? novœ-zealandiœ, Dana, (Orchestoidea? novi-zealandiœ).

This species is certainly the female of Talorchestia quoyana, and therefore ought to disappear from the catalogue. I have repeatedly found the two together, and in fact have seldom collected the one without the other. The males of the Talitrus, and the females of the Talorchestia, have never yet been described as such.

Genus Nicea.

Nicea, Nicolet, Gay's Chili, Vol. III., p. 237. 1849.

Galanthis, Spence Bate, Ann. Nat. Hist. 1857; and Cat. Amphip. Crust. Brit. Mus., p. 51. 1862.

This genus is defined as follows:— “Superior and inferior antennæ subequal, scarcely longer than the cephalon. The rest of the animal. generally resembling Allorchestes, except the telson, which is deeply cleft.”

It in reality includes all those Crustaceans which would range under Allorchestes, but for the cleft telson.

9. Nicea novœ-zealandiœ, nov. sp. Fig. B.1.

Eyes reniform. Inferior antennæ about one-fourth as long as body; flagellum slightly longer than base, with 13 or 14 articulations, which are minutely setose. Superior antennæ reaching to middle of flagellum of inferior; flagellum 14-jointed. Gnathopoda of first pair small; carpus produced inferiorly to a rounded lobe, furnished with a bundle of setæ; propodos sub-quadrate, inferior margin excavate about the middle and furnished with a bunch of setæ, palm transverse, defined by two stout spines, setose; a bunch of setæ at the articulation of the dactylos. Propodos of second gnathopoda large, ovate (almost pyriform) in male, palm very oblique, occupying nearly all the under surface, furnished with a double row of stiff setæ, and defined by two stout spines; dactylos long, slender,

arcuate. Same organ smaller in female, with the palm more transverse, and dactylos relatively shorter. First, second and third pairs of pereiopoda subequal; fourth and fifth longer; all with crests of short setæ at the joints. Telson deeply cleft, smooth. Colour yellowish, marbled with red. Length .5 inch.

Rock pools at Taiaroa Head (Otago Harbour).

10. Nicea finbriata, nov. sp. Fig. B.2.

Eyes round. Inferior antennæ about one-third as long as body; peduncle more than half as long as flagellum, penultimate joint crowned with a ring of short setæ, ultimate with a dense fringe of long, slender hairs on its inferior margin; flagellum from 17–22-jointed, each articulation with a dense bunch of long hairs on its inferior margin, diminishing towards the extremity. Superior antennæ half as long as inferior; flagellum 13–15-jointed, slender, minutely setose. First pair of gnathopoda with the carpus dilated; propodos broadly oblong, the palm very oblique, furnished with numerous setæ, and defined by two stout teeth. Gnathopoda of second pair large; propodos ovate, tapering to the extremity, lower margin densly fringed with long hairs, an excavation marking the very oblique and not well-defined palm. Pereiopoda subequal, second and third pairs rather the shortest. Telson cleft almost to the base, minutely tuberculated. Colour pale yellow. Length .8 inch.

Dunedin.

11. Nicea rubra, nov. sp. Fig. B.3.

Eyes round. Inferior antennæ half as long as body; flagellum four times as long as peduncle, with over fifty articulations, sparingly and minutely setose. Superior antennæ nearly half as long as inferior; flagellum 18-jointed, joints slender, with their apices expanded, minutely setose. Gnathopoda of first pair with the carpus rounded; propodos oblong-quadrate, setose on the inferior margin, palm extending along half its length, obliquely transverse, defined by two teeth, and furnished with two rows of setæ. Gnathopoda of second pair with the propodos ovate, palm extending obliquely along half of its inferior margin, furnished with two rows of stout setæ, but without any defining spines; dactylos long and curved, with two tubercles at the joint. Fourth and fifth pairs of pereiopoda longer than those preceding. Telson deeply divided into two acute, smooth lobes. Colour pink. Length .4 inch.

Dunedin.

Fam. II. Gammaridæ.

Genus Lysianassa, Edwards, Hist. Nat. Crust., iii, p. 20; Dana, U.S. Explor.

Exped., p. 908; Spence Bate, Brit. Mus. Cat. Amphip., p. 64.

Superior antennæ pyriform, very short, stouter than the inferior, and furnished with a secondary appendage. Mandibles having an appendage;

fringe of hairs on the lower surface. First pair of gnathopoda with carpus and propodos subequal, straight, and densely clothed with long, feathery hairs. Second pair with the carpus long, straight, and flat on the under surface, which is fringed with a double row of similar plumose hairs; propodos tapering and hairy; dactylos minute. Fourth and fifth pairs of pereiopoda longer and stouter than preceding pairs. Antepenultimate and penultimate pairs of pleopoda reaching to extremity of ultimate; all three pairs fringed with short spines. Telson short, reaching to extremity of peduncle of ultimate pleopoda, and furnished with a few short spines.

(No locality). Length .3 inch.

Sub-tribe. Hyperidea.

Fam. I. Hyperidæ, Spence Bate, Brit. Mus. Cat. Amphip. Crust. p. 287.

Superior antennæ, with a peduncle of three joints, and a variable flagellum. Inferior antennæ, with a five-jointed (?) peduncle, and multiarticulate flagellum. Gnathopoda more or less complexly subchelate. Four anterior pairs of pereiopoda subequal, normal. Three anterior pairs of pleopoda normal; three posterior pairs, broad, flat, and biramous. Integument thin and free from hairs.

Genus Themisto, Guérin-Méneville, Mém. de la Soc. d'Hist. Nat. de Paris, iv., 1828; Edwards, Hist. des Crust., iii., p. 84; Spence Bate, Brit. Mus. Cat. Amphip. Crust. p. 311.

Cephalon transversely ovate. Pereion not largely distended. Pleon slender. Eyes occupying the entire cephalon, dorsally separated. Antennæ subequal, as long as the cephalon is deep; superior pair having the flagellum not articulated; inferior pair having the flagellum more or less articulated. Mandible having an appendage. First pair of gnathopoda short, tolerably robust; carpus not having the anterior margin inferiorly produced; second pair having the carpus on the inferior angle anteriorly produced. First pair of pereiopoda having the carpus dilated; propodos narrow, and capable of being inflected against the carpus; second pair like the first; third pair twice the length of the second; carpus very long; propodos longer than the carpus, fringed along the anterior margin with a comb-like series of teeth, and capable of impinging against the anterior margin of the carpus; fourth and fifth pairs subequal, of the same form as the third, but not more than half the length. Three posterior pairs of pleopoda subequal, the last being the longest; rami double, lanceolate. Telson small, squamose.

The above description is taken from Spence Bate's catalogue, and from the examination of a great number of specimens I can vouch for its correctness as far as females are concerned, from which indeed all the descriptions appear to have been taken. The males, however, differ in the

The young, taken from the incubatory pouch of the female, differ somewhat from the adult. The back is smooth and rounded, whereas in the adult it is sharply keeled, and the segments of the pereion are produced posteriorly into teeth. The pereion is very broad and expanded. Antennæ subequal; superior stout and conical, three-jointed, terminal joint with a few short setæ at the extremity and two longer ones projecting at right angles from near the middle of the inferior margin; inferior pair somewhat more slender, and with very minute setæ. Some of the appendages also are either wanting or are not fully developed, probably the first or second pair of gnathopoda. Pleopoda normally developed.

These minute creatures approach in form and general appearance to Hyperia cyanea much more than Themisto. Every adult female had several of them in the incubatory pouch under the pereion.

Frequently washed up on Ocean Beach, Dunedin.

Fam. III. Platyscelidæ.

Cephalon round. Eyes large. Antennæ attached to the inferior surface. Epistoma proboscidiform; oral appendages rudimentary. Gnathopoda complexly subchelate. First two pairs of pereiopoda simple; two succeeding pairs having the basa largely dilated; fifth pair imperfectly developed. Posterior pleopoda foliaceous.

Genus Platyscelus, Spence Bate,
Brit. Mus. Cat. Amphip. Crust., p. 329.

Cephalon transversely ovate. Pereion distended; first segment narrower than the cephalon. Pleon much narrower than the pereion, having the fourth and fifth segments coalescing, the fifth and sixth pairs of pleopoda being attached to the posterior margin; sixth segment and telson fused together, the posterior pair of pleopoda being attached to the under surface near the middle of the segment. Superior antennæ short, consisting of a peduncle and a flagellum. Inferior antennæ not longer than the cephalon, consisting of four joints, concealed beneath the cephalon, not folded. Mandibles without an appendage. Third pair of pereiopoda having the basos largely dilated, and the remaining joints shorter than the basos; fourth pair having the basos twice as large as the third, the remaining joints not half so long as the basos; fifth pair membranous, a small tubercle representing the remaining joints. Three posterior pairs of pleopoda biramous, foliaceous, submembranous. Telson obtusely triangular.

20. Platyscelus intermedius, nov. sp. Fig. D.4.

Cephalon rounded in front. First two segments of pereion very narrow; succeeding broader, subequal. Eyes very large, occupying nearly the whole cephalon, with a large triangular red pigment spot on the outside of each. Epistoma triangular. Antennæ placed quite underneath the epistome.

Superior pair consisting of a stout peduncle, bearing a crown of cilia and a small tuberculate appendage, with a flagellum of two long slender articulations. Inferior antennæ four-jointed; first three joints subequal, with numerous cilia; fourth joint very short and furnished with a few long hairs at its extremity. First pair of gnathopoda with the carpus antero-inferiorly produced to an acute point almost to the extremity of the propodos, serrated on both margins, with numerous slender spines surrounding it near the base of the propodos; propodos narrow-oblong, serrated on both margins, with a small dactylos which antagonises with the extremity of the carpus. Second pair of gnathopoda similar to first, but rather larger, and with the carpus produced slightly beyond the extremity of the propodos. First two pairs of pereiopoda with the basos somewhat dilated; meros, carpus and propodos diminishing uniformly in size and quite smooth; dactylos very small, acute. Third pair with the margin of the basos quite smooth, and the distal extremity sub-acute; ischium articulating subapically within the posterior margin; remaining joints about half as long as the basos; meros and carpus quite smooth; propodos slender, slightly longer than the preceding joints, and serrated on the posterior margin only. Fourth pair of pereiopoda with the basos posteriorly arcuate and anteriorly excavate, rounded at the extremity; ischium articulating within the posterior margin near the centre; remaining joints about one-third as long as basos; meros very small; carpus long; propodos half its length, both serrated on the posterior margins; dactylos long, nearly straight, sub-acute. Fifth pair of pereiopoda membranous; basos curved forward nearly to a right angle; remaining joints represented by a small tubercle. Three last pairs of pleopoda foliaceous; ante-penultimate pair having a short peduncle, the rami somewhat unequal, margins smooth; penultimate pair with a long peduncle and rami subequal, outer ramus finely serrate on its outer margin; ultimate pair with the peduncle rather short and rami very unequal; external ramus minute, lanceolate, with smooth margins; internal ramus oblong, oblique, finely serrate on the distal half of both margins. Telson triangular, obtusely pointed.

Colour yellow, nearly transparent, with small red spots. Length .5 inch. Can roll itself almost into a ball.

Washed up on the Ocean Beach at Dunedin.

I have named this species as above, from the fact that it is almost intermediate between the only two species hitherto described–P. rissoinœ, Bate, and P. serratus, Bate.

Spence Bate remarks of this genus:- “It appears to me to be not improbable that Platyscelus may prove to be the female of Typhis (Thyropus), from which it differs, only in the form of the superior and length of the inferior antennæ.”

Group Aberrantia.

Coxæ of the pereiopoda not squamiformly developed, some, or all, being fused to their respective segments. One or more segments of the pleon absent.

Fam. Caprellidæ.

Pleon rudimentary. Oral appendages normally developed. Coxæ fused with the pereion. Branchial sacs attached to the first two or three segments of the pereion.

Genus I. Caprella, Lamarck, Syst. des. Anim. sans Vert., p. 165; Edwards, Hist. Nat. Crust., iii., p. 105; Spence Bate, Brit. Mus. Cat. Amphip. Crust., p. 353.

Body cylindrical. Cephalon and first segment of the pereion confluent. Pleon rudimentary. Gnathopoda subchelate. First two pairs of pereiopoda represented by the branchiæ attached to their respective segments only; three posterior pairs of pereiopoda subequal. First and second pairs of pleopoda rudimentary in the male; the rest obsolete.

21. Caprella caudata, nov. sp. Fig. D.5.

Female. Body rather robust. Cephalon smooth, not toothed nor tuberculate, short; four succeeding segments of pereion subequal. Eyes round. Superior antennæ more than half as long as body; first joint of peduncle with an acute spine on the antero-superior margin; second joint longest; flagellum about 15-jointed (first few fused together), as long as peduncle, and spinose at the articulations. Inferior antennæ more than half as long as the superior; two basal joints short and smooth; the rest fringed on their lower margin with long hairs. Maxillipeds well developed, unguiculate, ciliate on the lower margin, with the carpus distended. First pair of gnathopoda small and fringed with hairs; carpus with a deep transverse incision; propodos ovate, dactylos long and slender. Second pair of gnathopoda large; propodos narrow-ovate, with the palm extending along the greater part of the lower margin, with a large tooth surmounted by two spines to receive the point of the dactylos, and two smaller teeth nearer the hinge corresponding to two indentations in the dactylos; dactylos stout, curved. Branchiæ narrow-oblong. Ovigerous pouches nearly circular, thickly ciliated on their inner margins. Three last pairs of pereiopoda increasing in size posteriorly, similar in shape; in all the propodos is narrow, excavate along its anterior margin to receive the slender curved dactylos, point of impingement of which is marked by two serrated spines. First pair of pleopoda rudimentary, represented by minute tubercles. Pleon prolonged into a slender flat expansion.

Dunedin, in rock pools. Length 4 inch.

Genus Caprellina, nov. gen.

Body cylindrical. Cephalon confluent with first segment of pereion. Pleon rudimentary. Gnathopoda sub-chelate; branchiæ attached to second pair. First two pairs of pereiopoda represented by the branchiæ attached to their respective segments; third pair feebly developed; two posterior pairs well developed, subequal. First and second pairs of pleopoda rudimentary in the male, rest obsolete.

This genus appears to be intermediate between Cercops and Caprella. From the former, it differs in not having the pleopoda developed, but agrees with it in having branchiæ attached to the second gnathopoda. In respect to this latter character it differs from its nearer ally Caprella, and also in having the third pair of pereiopoda feebly developed.

The genus contains only the following species:—

22. Caprellina novœ-zealandiœ, nov. sp. Fig. D.6.

Body slender. Second and third segments of pereion shorter than the three following; last segment very short. Superior antennæ nearly half as long as animal; basal joint of peduncle stout, two succeeding joints long and slender; flagellum setose, semi-articulate at the basal end, ending in about ten articulations. Inferior antennæ very short, reaching to middle of penultimate joint of peduncle of superior. First pair of gnathopoda with the propodos ovate, the palm extending along the inferior margin, fringed with cilia, and with two spines at the base; dactylos sparingly ciliated on inner margin. Second pair of gnathopoda much larger than first, and having the basos very long. Propodos long, narrow ovate, palm extending along half the inferior margin, hollowed out, and with two or three small spines at the denticulation which receives the point of the dactylos, and a tooth near the hinge; dactylos slender, arcuate. Third pair of pereiopoda very small, but with well-developed carpus, propodos and dactylos. Fourth and fifth pairs of pereiopoda long; propoda well-developed, narrowovate, with slightly excavated palms fringed with strong spines; dactylos minutely ciliate on inner margin. Two pairs of pleopoda present, one-jointed, filiform, fringed with minute, comb-like cilia. Colour pale red, with dark spots and markings. Length .8 inch.

Dunedin, in rock pools.

Description of Plate X.

Fig. A (all enlarged)–