SUTER : NEAV ZEALAND TROCHID.E. 2()1 



a white gTound. Columella with almost imperceptible fold above. 

 False umbilicus almost filled up, smooth. Alt. 7'5, diam. 9 mm. 



Hal, — 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. Trochus oppeessus (Hutton). 

 Gibhula opj^rcssa, Hutton: Journ. de Conch., 1878, p. 34; Man. New 

 Zealand Moll., 1889, p. 102 ; Proc. Linn. Soc. New South 

 Wales, vol. ix, p. 364 ; Trans. New Zealand Inst., vol. xv, 

 p. 124, pi. xiv, fig. M (radula) ; Pilsbry, Man. Conch., 

 ser. I, vol. xi, p. 232, pi. xl, figs. 4, 5. 



Dark olive-brown, tessellated with darker markings. Beach speci- 

 mens, havmg lost the periostracum, are white with fuscous 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. 6 mm. 



The presence of a false umbilicus, quite exceptional in Gibhula, 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 Gibhula^ 

 and its proper place is no doubt under Trochas. 



Hub. — 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^, protocouch 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, 

 arc coarser near the axis, in others they are of nearly equal size. 

 Eadula the same as in the type ; no jaw. Alt. 7'5, diam. 7*5 mm. 



Ilah. — Dunedin Harbour, under stones ; only a few specimens (H. S.). 



Sect. ANTHOiiA, Gray, 18-57. 

 4. Trochijs vieidis, Gmelin. 



Trochus viridis, Gmel. : Syst. Nat., 13th ed. (1788), p. 3572, No. 34 ; 



Hutton, Proc. Linn. Soc. New South Wales, vol. ix, 



p. 358 ; Pilsbiy, Man. Couch., ser. i, vol. xi, p. 43, pi. iii, 



figs. 16, 17, aiid vol. x, pi. xl, fig. 21. 

 Anthora viridis (Gmel.) : Hutton, Man. New Zealand Moll., p. 94. 

 Pulydonta tuberculata, Gray : Dieffenbach's " New Zealand," vol. ii, 



p. 239. 

 Anthora tuberculaia (Gray): Hutton, Trans. New Zealand Inst., 



vol. XV, p. 124, pi. xiv, fig. K (radula); Hutton, Man. 



New Zealand Moll., p. 93. 



