Amphilochus marionis Stebbing, 1888.

• Amphilochus marionis Stebbing, 1888: 743, Pl. 38, Stebbing, 1906: 151, Stebbing, 1910: 577, Schellenberg, 1938: 17.

• Gitanopsis marionis Schellenberg, 1931: 95.

• Amphilochus marionis, Chilton, 1923: 240. Chilton, 1925a: 84-85 (not Stebbing).

Schellenberg (1938) has pointed out that Amphilochus marionis and Amphilochus squamosus are not synonymous, and that the latter in fact is a Gitanopsis. Chilton's two papers indicate clearly that his specimens also had the strong molar process of Gitanopsis.

The only sign of A. marionis in the Chilton Collection is fragmentary material mixed in a slide also containing G. squamosa. There is no indication of its locality and for the purposes of this paper it is best disregarded.

Schellenberg (1931) states that he has a small collection from Lyttelton Harbour which includes 2 specimens of A. squamosus and 2 of A. marionis. This satisfactorily establishes the presence of A. marionis in New Zealand waters.

Amphilochus filidactylus, n.sp. (Figs. 67-90.)

• Gitanopsis pusilla, Stephensen, 1949: 8, Fig. 1 (not Barnard).

Eyes in spirit black, reniform; animals in life reddish with black spots. Length, 4 mm. Like Gitanopsis squamosa (cf. below) except for the following details.

Antennae. First: First segment of peduncle slightly shorter than 2nd; 3rd ⅔ 2nd, tufts of spines and spine-setae on superodistal angles of 1st and 2nd, single group ½ along 2nd superiorly. Accessory flagellum of 1 segment, ½ length 1st segment of flagellum, has 2 or 3 long end setae. Second: Peduncle, 3rd segment about ½ length 4th, as wide, superodistally produced in 2 small rounded projections, 1 with large spine-seta, about 3 spine-setae on superior margin; 4th has 3 sets of 1-6 spine-setae on each margin, these also on distal angles especially inferior; 5th not ¾ length 4th, 2 or 3 groups of 1 or more spine-setae on each margin, also on angles; flagellum of 8 segments, as long as 4th peduncle segment, 3 or 4 fine setae on each distal angle.

Mouthparts. Lower Lip: Inner margin notched medially, small rounded bristled boss distally, 2 sets of 3 long teeth on inner margin below. First Maxillae: Inner plate has 2 end setae; outer has 7 stout teeth, palp 3 short spines and 1 seta. Second Maxillae: Inner plate has approximately 11 fine end setae, 3 or 4 fine bristle-setae proximally. Outer has 3 end spine-setae, a few bristles outside these. Mandibles: Molar process a produced conical tubercle narrowing to small truncate tip; spine-row of about 19 spines, the lower 9 less strong and tending to be fused; right cutting edge of about 8 strong serrations, left of 10 or so fine serrations, accessory of about 16 fine serrations. Palp of 3 segments, 1st small, about ½ length 2nd, 2nd about ⅔ length 3rd, which has no setae, is finely bristle-combed, narrows to acute tip. Maxilliped. Inner plate has 2 very small, boss-like spines on end margin; outer plate distally rounded, has stout end spine, finely serrate margin, seta inside spine, a few down margin. Palp merus width ⅔ length, outer margin has 5 single setae, inner about 6, carpus almost as wide as long, length about ⅗ merus, seta ⅓ along outer margin, 2 or 3 on angle, inner margin has 7 or so on distal angle; propod width ½ length, length ⅔ merus; 1 or 2 spines at ⅓, ⅔ and distal angle of outer margin; 8 or so on inner distal angle, at their base 5 small blunt comb-fingers. Dactylos a straight sharp spike, little more than ½ propod length, inner margin finely combed.

Gnathopods. First: Sideplate somewhat trapezoid, anterodistally rounded with fine setae on margins. Basos proximal width about ¼ length, boatshaped with double anterior margin, concave between margins, to receive propod; anterior margins finely setose. Ischium about ⅕ basos; merus about ⅓ basos, subtriangular, about 4 spine-setae on posterior margin, 7 or 8 spine-setae on posterodistal angle. Carpus as long as ischium, distally widening to more than twice length, posterior ½ strongly spine-setose especially angle which extends nearly ½ along propod posterior margin. Propod width a little more than ½ length, margins convex, posterior rounding to convex distal palm margin and separated from it only by 2 small, stout defining spines; the palm has about 16 small setae slightly below finely serrate margin. Dactylos curved, as long as palm is wide, stout tooth on inner margin about ½ along, 12 or so fine comb-teeth inside tooth, dactylos stout except for last ⅕ which is noticeably filiform. Second: Sideplate ovately-subrectangular, width ½ length, angles rounded, margins finely setose. Basos as before, widest distally, distal width ⅓ length; ischium wider than long, length about ⅙ basos, merus subtriangular, length ⅓ basos, narrowing bluntly to a stout spine and several short spine-setae, 4 strong spines on posterior margin: reaching as far as propod base. Carpus subtriangular, anterior margin not ⅓ basos, posterior produced in long, slender, spoon-shaped process almost but not quite to palm defining angle, the process has 2 or 3 long terminal spine-setae, 10 or 11 short setae on inner margin. Propod ovate-rectangular, widest distally, distal width about ⅔ length, length ⅚ basos, lateral margins more or less straight, postero-distal angle rounding to fully crenulate slightly convex palm which is defined by 2 stout spines and has 9 or so fine setae below margin, stouter one inside dactylos base, dactylos as before.

Peraeopods. First: Like G. squamosa, perhaps more spinous. Second: Setae on posterodistal angle give crimped appearance as in Stebbing's A. marionis. Third: Sideplate posterior lobe deeper than anterior, almost basos length; basos ovate, anterior margin has about 18 short stout spines, posterior minutely and regularly setose; other segments seem comparatively strongly spined. Fourth and Fifth: Basos like Pr. 3, more strongly spined anteriorly than in G. squamosa.

Epimeral Plates: All have rounded anterodistal angle, slightly produced acute posterodistal angles; are subrectangular; 1st almost subtriangular; posterior margins slightly sigmoid; ventral have 4,14 and 16 spine-setae.

Uropods. First: Much the longest; peduncle slightly longer than subequal rami; has about 16 spines dorsally; rami have 7 or 8 spines on one or both margins, spines each in marginal serration. Second: Outer ramus about ⅔ peduncle length, inner ¾; outer has 5 and 2 marginal spines, inner has 4 and 5, the median margins finely pectinate. Third: much the smallest; outer ramus the shorter, has 4 spines on outer margin, 1 on pectinate inner; inner ramus as long as peduncle, 3 spines on inner margin, 5 on outer; the median margins finely pectinate; the spines in sharp serrated pockets; 4 or 5 spines on peduncle. Telson: Width about ⅔ length, narrowing distally from about ½ to rounded blunt tip.

Localities: Off Pyura pachydermatina stalk with encrusting Elzerina blainvilli, Portobello. Marine Biological Station, coll. D.E.H., 15/5/52.

Distribution: New Zealand; Tristan da Cunha.

Types: Slides P. 130, female.

Discussion. This species keys out according to Stephensen's key (1949) as G. pusilla or G. tortugae. G. pusilla is not very fully described, but I have speimens