261 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 
a white ground. Columella with almost imperceptible fold above, 
False umbilicus almost filled up, smooth. Alt. 7°5, diam. 9mm. 
Hab.—Chatham Is. only. 
The specimens reported by Mr. T. W. Kirk as having been found 
near Wellington very likely do not belong to this species, but to 
T. oppressus, Hutton. 
3. Trocuus oppressus (Hutton). 
Gibbula oppressa, Hutton: Journ. de Conch., 1878, p. 84; Man. New 
Zealand Moll., 1889, p. 102; Proc. Linn. Soc. New South 
Wales, vol. ix, p. 364; Trans. New Zealand Inst., vol. xy, 
p. 124, pl. xiv, fig. M (radula); Pilsbry, Man. Conch., 
ser. I, vol. xi, p. 232, pl. xl, figs. 4, 5. 
Dark olive-brown, tessellated with darker markings. Beach speci- 
mens, having lost the periostracum, are white with fnscous markings 
Whorls keeled above the middle. Body-whorl biangular. Entire 
surface closely, finely, spirally striate. Columella oblique, straight, 
inserted in centre of base. Alt. 5°5, diam. 6mm. 
The presence of a false umbilicus, quite exceptional in Gibbula, led 
me to re-examine the radula. I found the teeth to correspond with 
Hutton’s description and figure, but the point of great importance is 
the absence of a jaw. It therefore cannot belong to the genus Gibbula, 
and its proper place is no doubt under Zrochus. 
Hab—Under stones near low-water mark, scarce, Auckland, Lyall Bay. 
Var. Dunedinensis, n.var. 
Differs from the type in being larger and in the body-whorl being 
only faintly angular; the colour is rather darker, but the markings 
are the same. Whorls 5%, protoconch minute, distantly spirally 
striated. Spire- whorls not keeled in the middle or above it, but 
slightly convex, nodulous below the suture, with a well-developed 
cingulus above the nodules; 6—7 cinguli on the penultimate whorl. 
On the last whorl and the base the cinguli are crossed by very fine and 
dense lines of growth. In some specimens the cinguli of the base, 8-9, 
are coarser near the axis, in others they are of nearly equal size. 
Radula the same as in the type; no jaw. Alt. 7:5, diam. 7°5 mm. 
Hab.—Dunedin Harbour, under stones ; only a few specimens (H. 5.). 
Sect. ANTHORA, Gray, 1857. 
4. Trocnus vrripis, Gmelin. 
Trochus viridis, Gmel.: Syst. Nat., 13th ed. (1788), p. 3572, No. 34; 
Hutton, Proc. Linn. Soc. New South Wales, vol. 1x, 
p. 858; Pilsbry, Man. Conch., ser. 1, vol. xi, p. 48, pl. iu, 
figs. 16, 17, and vol. x, pl. xl, fig. 21. 
Anthora viridis (Gmel.): Hutton, Man. New Zealand Moll., p. 94. | 
Polydonta tuberculata, Gray: Dieffenbach’s ‘“‘ New Zealand,” vol. u, 
p. 2389. 
Anthora tuberculata (Gray): Hutton, Trans. New Zealand Inst., 
vol. xv, p. 124, pl. xiv, fig. K (radula); Hutton, Man. 
New Zealand Moll., p. 93. 
