SHELLS. 241 



Fam. jANTHINIDjE. 



97. Janthina exigua. Lam. Sow. Gen. f. 



Inhabits New Zealand. Coast of Taranaki N. Island. 

 Dr. Dieffenbach. 



Fam. NATICID.E. 



98. Natica Zelandica. Quoy et Gaim., Voy. Astrol., ii. 



237, t. 66, f. 11, 12. 



Inhabits New Zealand. E. coast, N. Island. Dr. Dief- 

 fenbach. 

 The operculum is shelly, rather concave externally. Mr.Bidwell- 



Fam. LITTORINID^E. 



99. Cerithium bicarinata. 



Inhabits New Zealand. Dr. Stanger. Bay of Islands. 



Dr. Sinclair. 



Shell turreted, brown ; whorls rather convex, strongly spirally 

 striated, and indistinctly transversely plicated ; the body whorl, 

 with two ridges on its outer edge, separated by a concave groove ; 

 mouth ovate, with a short canal in front. 



100. Cerithium australis. 



Inhab. New Zealand, Bay of Islands. Dr. Sinclair. 

 Shell ovate, rather turreted, black, slightly longitudinal plicated, 

 whorles nearly flat, with two distant spiral grooves on the hinder 

 half. The front of the last one with two distinct prominent spiral 

 ridges, the hinder rather in front of the back edge of the inner lip, 

 and the anterior one round the canal ; mouth ovate, inner lip with 

 a distinct ridge behind ; canal short, open. 



101. Amnicola antipodanum. 

 Inhabits New Zealand, in fresh water. 



Shell ovate, acute, subperforated (generally covered with a brown 

 earthy coat) ; whorls rather rounded, mouth ovate, axis 3 lines ; 

 operculum horny and subspiral : variety, spire rather longer, 

 whorls more rounded. 



This species is like Pajudina nigra of Quoy and Gaimard, but 

 the operculum is more spiral. Quoy described the operculum as 

 concentric, but figured it subspiral. Paludina ventricosa of Quoy is 

 evidently a Nematura. 



102. Amnicola ? Zelandice. 



Inhabits New Zealand, in fresh- water ditches. 



VOL. II. R 



