Art. XXXVI.—Additions to the New Zealand Fauna
[Read before the Auckland Institute, 6th December, 1905.]
Trochus camelophorus (= rope-bearing), n. sp. Figs. 1, 1a.
Shell solid, conical, rose-coloured with darker markings of the same. Whorls 5 ½, somewhat bulging at the periphery. Sculpture: Rounded cinguli with rope-like markings, three on the third whorl, then four, five above the aperture, six on the outer lip above the periphery; between the third and fourth ropings on the penultimate whorl a narrow cingulus appears. Protoconch two-whorled, smooth, waterworn. Sutures marked by a deep groove behind the first roping succeeding whorl. Base with six flat spirals separated by a slightly narrower furrow; on these spirals are two or three subspirals. The colouring only appears on the raised surfaces; it fades towards the false umbilicus, which is funnel-shaped, with two deep spiral grooves, the posterior of which does not reach the columella-edge. The columella is nearly vertical, very slightly arcuated, and has what looks like a prominent tubercle near its insertion (it is really the end of a spiral fold); the ridge separating the two grooves is rounded and highly polished. Aperture subquadrate; lip simple, advancing at the suture. Height, 1 cm.; major diameter, 12 mm.
Hab. Cape Maria van Diemen.
Animal and operculum unknown.
One specimen in my collection has the grooves in the funnel narrower and the dividing ridge wider and slightly concave. The pink colour of this shell may be due partly to exposure.
Mr. C. Hedley very kindly compared the type with the Trochi in the Australian Museum, and writes, “I should regard this shell as a very distinct new species.”
Trochus (Clanculus) takapunaensis, n. sp. Figs. 2, 2a.
Shell with five slightly rounded whorls, of which one and a half are smooth. Sculpture: Smooth rounded spirals, of which the two upper are close together and the others far enough apart to admit a fine spiral thread in the radially striated hollow between them; above the peripheral spiral on the body-whorl is a narrower one which appeared in the suture of the third whorl. Colour yellow-grey, with very dark irregular patches all of which shade into white from left to right. Sutures deeply
grooved behind the succeeding whorl. Base with seven or eight spirals separated by furrows of the same width, coloration as above. False umbilicus deep, funnel-shaped, contracted at the margin by a spiral rib with occasional tubercles; columella arcuated, having a blunt tubercle on the funnel side, and a long fold transversely wound over the anterior end and passing into the shell. In my figure 2a the white extension near the body-whorl represents the spread of the columella at the point of junction. Aperture with numerous irregular denticles, some of them extending far into the shell. Height, 5 mm.; major diameter, 7·5 mm.
Hab. Takapuna, in shell sand.
Mr. C. Hedley, to whom I sent this shell as T. ringens, is good enough to reply,”… too remote from that species to be worth comparing …Your shell has a close resemblance to the Victorian C. plebeius.” I believe that the transverse fold on the columella, and the absence of a biplicate tooth at that point, separates this shell from C. plebeius, and also from C. variegatus, Ad., recorded by the late Professor Hutton (see Man. N.Z. Mollusca, 1880, p. 95)
Trophon waipipicola, n. sp. Figs. 3, 3a, 3b.
Shell fusiform, grey, with seven whorls, of which one and a half form the protoconch, which is smooth, with a smooth keel on the last half-whorl. Sculpture: A noduled keel on the second and third whorls, a second row appearing on the fourth and fifth in the suture; the body-whorl has three keels, the middle one being the smallest; the nodules are lengthened in a spiral direction, and are situated on longitudinal buttresses which are faint towards the suture and the base. There are no spiral striæ between the keels, such as one finds in Siphonalia dilatata, of which the shell is otherwise a miniature; the tabulation below the suture is plain; on the base are four spirals, the lowest being the strongest. The canal is straight and open, the extremity projecting beyond the pillar, on which are a few transverse folds. Columella smooth, brown, arcuated and slightly concave. The horny operculum has the nucleus apical, and a projection on the inner side as in Siphonalia; the attachment scar is auriform. Dentition: Five cusps on straight plates narrowed anteriorly, the centre and two outside cusps being the largest; there is a reversely arched strengthening-ridge on each plate, and a similar small one above it; the laterals are bicuspid, webbed up to the points. There are three slight folds on the outer edge of the canal. Height, 1 cm.; major diameter, 5 mm.
Hab. Waipipi, on mud-flat.
The operculum and sculpture of shell are similar to Siphonalia; the dentition is nearer Trophon.
Phrixgnathus serratocostata, n. sp. Figs. 4, 4a.
Shell of four and a half rounded whorls, horny without markings; the limitation of the coarse protoconch is not clearly defined, but there is a one-and-a-half-whorled smooth apex; the body-whorl has twenty-one flanges, wide on the periphery and rapidly diminishing towards the suture, the entire length beset with close-set hooked teeth, turned towards the apex; the spaces between are clearly reticulated with revolving and incremental striæ; the flanges are not continued on the base, but are represented by striæ of varying strength. Periphery bluntly angled; columella widely reflexed above, perforation about one-twelfth of the major diameter. Major diameter, 1 mm.; height, 0·75 mm.
Two specimens, one with the animal; but as my microscope does not easily separate very minute teeth I have deferred mounting the radula, and depended only shell characteristics.
Unio (Diplodon) websteri, Simpson. Figs. 5, 5a, 5b.
As this shell has not yet been figured, I give a careful pen-and-ink drawing, after accurate measurements both of outline and sculpture. I also at fig. 6 give a similar drawing of Diplodon novœ-hollandiœ, Gray, for comparison.
Mr. H. Suter* says, “I consider Diplodon websteri as a Dmenziesi in which the nodulous sculpture is developed to the highest degree.” If this is correct we should find every stage of nodulous development; such is, however, not the case as far as I am aware. There is, I believe, nothing between the mere indications of such sculpture in D. menziesi and the fully developed D. websteri. I have recently seen a single valve of the shell in Mr. R. Murdoch's collection: it was found in the Wanganui River. The hinge of Simpson's species (which must not be confounded with Unio websteri, Wright) is much more developed than that of D. menziesi. The shell I have figured is the co-type, the type being in the Smithsonian Institute at Washington. I have other specimens in which the nodules are carried out to the anterior margin, and the outline approximates more to that of the Australian shell, inasmuch as the
[Footnote] * Trans. N.Z.Inst., vol. xxxvii, p. 236.
anterior and posterior dorsal angles are much less apparent, thus narrowing the shell before and behind. Old specimens are much more thickened within than D. menziesi, and consequently much heavier; the nacre is also more brilliant.
I append the short description of this shell by Mr. Simpson (“Nautilus,” July, 1902): “Shell long, rhomboid, compressed or subcompressed, inequilateral; beaks subcompressed, pointed, their sculpture apparently a few irregular lachrymose nodules arranged in a somewhat radial pattern; surface with uneven growth-lines and impressed rest-marks, sculptured throughout with lachrymose nodules, which are often V-shaped, those along the upper part of the low posterior ridge slightly knobbed; epidermis dark olive-green clouded with lighter green, rather dull; pseudo-cardinals small, subcompressed, granulose, two in each valve; laterals straight, two in the left valve, one in the right; muscle-scars small, shallow, and irregular; nacre bluish, lurid-purple near and in the beakcavities, thicker in front. Length, 67 mm.; height, 32 mm.; diameter, 14 mm.: length, 62 mm.; height, 32 mm.; diameter, 17 mm…. A new species apparently allied to D. novœ-hollandiœ, Gray, of Australia, but smaller, less inflated, and less solid than that species. In D. novœ-hollandiœ the anterior one-third of the shell is almost destitute of nodules, in the present species the whole surface is covered with them. These resemble somewhat those found in the Unio tuberculatus, Barnes, but are less elevated.”
Turbo shandi, Hutt. (Astralium Ind. F.N.Z.)
I recently received from Mr. R. Murdoch two specimens of this shell authenticated by the late Professor Hutton: they proved to be the young of Turbo granosus, Mart.
Explanation Of Plate XXXIX.
Fig. 1.Trochus camelophorus, Webster.
Fig. 2.T. (clanculus) takapunaensis, Webster.
Fig. 3.Trophon waipipicola, Webster.
Fig. 4.Phrixgnathus serratocostata, Webster.
Fig. 5.Unio (Diplodon) websteri, Simpson.
Fig. 6. Unio (Diplodon) novœ-hollandiœ, Gray