GASTEROPODA. 



Species of this genus are Buccinums with a truncated colu- 

 mella. 



Distribution, 5 species. China, Central Ameria, Vigo Bay. 

 Fossil, 3 species. Eocene. Paris basin. 



[Family Purpuridje] 



Is composed of the following genera : — 



Purpura, including Monoceros (of sectional value)* and the 

 sub-genera : — 



Concholepas, Cuma, Rapana (see p. 217, under Pyrula), 

 Pinaxia, Adams. 



Iopas, H. and A. Adams, 1853. Shell bucciniform, with a 

 small canal in the posterior angle of the aperture. Fossil, 

 3 species. Eocene. Paris. 



Vitularia, Swainson, 1840. Y. salebrosa. South and Central 

 America. Shell with irregular varices ; operculum as in Purpura. 



Nitidella, Swainson. Shell as Cylindra ; spire sometimes 

 decollated ; lip continuous or crenated ; operculum elongate ; 

 nucleus lateral. 



Eicinula, Harpa, Ehizochchilus (Coralliophila, Adams), 

 and Magilus, with the 



Sub-genus Leptoconchus, Kuppell. 



Shell similar to that of Magilus; young shell only with an 

 operculum. 



[Family Cassid^e.] 



The genera referred to this family are : — 



Eanella (p. 214), Triton (p. 214), Pyrula (p. 217), Cassis 

 (p. 224), Oniscia (p. 225), Cassidaria (p. 225), Dolium 

 (Malea) (p. 226), and 



Nassaria, Pfeiffer. 



Animal analogous with that of Ranella, as regards the length 

 of the tentacles, position of the eyes, smallness of the head, 

 and by the form of the operculum, but is provided with a long 

 branchial siphon. 



Shell sub-canaculated in front, and deeply notched. 



[Family Olivil\ze] 



Includes Oliva {Olivella, Scaphula, Agaronia), Ancillaria 

 (Monoptygma, Lea).f 



* See p. 223. t See p. 227. 



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