GASTEROPODA. 
Species of this genus are Buccinwms with a truncated coli 
meila, . 
Distribution, 5 species. China, Central Ameria, Vigo Bay. 
Fossil, 3 species. Hocene. Paris basin. 
[FAmMILy PURPURIDZ] 
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. 
Jopas, H. and A. Adams, 1858. Shell bucciniform, with a 
small canal in the posterior angle of the aperture. fossil, 
3 species. Eocene. Paris. 
Vitularia, Swainson, 1840. VY. salebrosa. South and Central 
America. Shell withirregular varices; operculum as in Purpura. 
Nitidella, Swainson. Shell as Cylindra; spire sometimes 
decollated; lip continuous or crenated; operculum elongate; 
nucleus lateral. 
RICINULA, HARPA, RHIZOCHCHILUS (Coralliophila, Adams), 
and MAGInusS, with the 
Sub-genus Leptoconchus, Rippell. 
Shell similar to that of Magilus; young shell only with an 
operculum. 
{FAMILY CASSIDZ. | 
The genera referred to this family are :— 
RANELLA (p. 214), TRITON (p. 214), PYRULA (p. 217), Cassts 
(p. 224), ONnIscrA (p. 225), CASSIDARIA (p. 225), Doxtium 
(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. 
[Famity OLrIvipz] 
Includes Oxtva (Olivella, Scaphula, Agaronia), ANCILLARIA 
(Monoptygma, Lea).t 
* See p. 228, ¢ See p. 227. 
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