202 PROCEEDINGS OF THE M.VLACOLOGICAL SOCIETY. 



Trochus acinosus, Gould: U.S. Explor. Expcd., Moll. p. 179, fig. 217. 

 Trochus fulvolahris, Hombr. & Jacq. : Voy. Pole Slid, Zool. vol. v, 



p. 56, pi. xiv, figs. 14-16. 

 Polydonta tritonis, A. Adams : Proc. Zool. Soc, 1854, p. 132. 

 Anthora tritonis (A. Ad.) : Hutton, Man. New Zealand Moll., p. 94. 



Seven whorls ; five series of granulated spiral lirae on penultimate 

 wliorl. Columella with a deep fold above. Umbilical area with 3-4 

 spiral ribs. Alt. 20, diam. 19 mm. 



Hab. — On rocky ground near low- water mark from Whangarei to 

 Duuedin. Hather rare in the North, but attaining a larger size. 



Subgen. Clanculus, Montfort, 1810. 



5. Trochus eingens (Monke). 



llonodonta ringem, Meuke : Moll. Nov. Holl. 8peo., 1843, p. 14, 

 No. 53 (not J/", rinf/ens, Philippi, 1846). 



Trochus rimiens (Menke) : Philippi, Conch. Cab., p. 235, pi. xxxvi, 

 fig. 1 ; Pischer, Coq. Viv., p. 213, pi. Ixxi, fig. 1 ; Pilsbry, 

 Man. Conch., ser. i, vol. xi, p. 81, pi. xi, figs. 49, 50. 



Shell perforate, conical ; whorls 7, the first smooth, yellowish, 

 following planulate, separated by canaliculate sutures, maculate with 

 chestnut and white, spirally cingulato above with four elegantly granu- 

 late ridges, the upper and lower larger, last whorl acutely carinated ; 

 base slightly convex, ornamented with 8-9 granose cinguli ; aperture 

 rhomboidal, oblique, narrow ; basal margin sulcate - denticulate ; 

 columella strong, oblique, terminating below in a large tooth, ringent 

 above; columella callous, ringent, plicate. Alt. 10, diam. 11mm. 

 (Fischer). Sometimes the altitude exceeds the diameter. 



My specimen from Mokohinau Island, which agrees in every respect 

 with Fischer's excellent description, measures 12 X 10"5mm. 



Ilah. — Cape Maria van Uiemen (C. H. Pobson) ; Mokohinau I. 

 (caretaker of the lighthouse). 



This is a new addition to the fauna of New Zealand. In Hutton's 

 Man. New Zealand Moll. Clanculus varicf/afus, Adams, is mentioned, 

 loc. Auckland ('?), but in his revision (1884) it is omitted from the 

 list of New Zealand mollusca. Whether Trochus riiigens was 

 erroneously taken for T. variegatus or not, I do not know. 



Genus MONODONTA, Lamarck, 1801. 



Subgen. Diloma, Philippi, 1845. 



Sect. NEOBiLOMA, Fischer, 1885. 



6. MoNODONTA iExHiors (Gmelin). 



Trochus JFJMops, Gmelin: Syst. Nat., 13th ed., p. 3596, No. 32. 

 Trochus Zealamlicus, Quoy & Gaim. : Voy. Astrolabe, Zool. vol. iii, 

 p. 257, 1)1. Ixiv, figs. 12-15. 



