•266 DELPHINULA 



Family TROCHIDiE. 

 Sub-family Delphinultn.e. 



Shell turbinate or subdiscoidal, umbiiicate, solid, pearly witliiu 

 whorls loosely coiled, the last frequently free from the preceding, 

 more or less angulated, rudely spirally lirate, scaly or spinose ; 

 aperture circular, peristome sinuous on the columellar margin, acute, 

 often slightly produced or subrostrate below. Operculum thin, 

 corneous, multispiral. 



Animal with large foot ; epi2:>odial line bearing cirri ; without 

 inter-tentacular lobes ; eyes on short peduncles at the outer bases of 

 the tentacles ; tentacles long, slender ; mouth provided with jaws ; 

 radula with the formula oo . 5-1-5 . oo , the central tooth broader 

 than long, with a broadly reflected simple cusp, lateral teeth with 

 cusps, the two outer very large; marginals with short simple cusps, 

 the outermost with serrate cusps. 



The relations and limits of tliis subfamily will be more fully 

 considered in the monograph of the Trochidcb in the next volume of 

 the Manual. 



Synopsis of recent Genera. 



Genus DELPHINULA Lamarck, 1808. 



Shell rather large, solid, umbilicated, turbinate, the upper whorls 

 flattened, the last descending, rudely spinose or scaly, more or less 

 carinated, but slightly in contact with the preceding ; aperture cir- 

 cular ; peristome usually sgmewhat produced at base. 



Angaria (Bolt. 1798) H. & A. Adams, 1858, is a synomyn. 



In this genus were formerly included the species now classed in 

 Liotia, Collonia and some other genera. 



Subgenus Angarina Bayle, 1878. 

 Shell depressed, discoidal, sinistral (?), widely umbiiicate, spirally 

 lirate, aperture , rounded ; umbilical area bounded by a series of 

 spines. Animal and operculum unknown. Delphinidopsis Wright, 

 1878, (preoc.) is synomymous. Probably not a valid genus. 



Genus DELPHINULA, Lam., 1803. 



D. LAciNiATA Lamarck, 1819. PI. 67, figs. 1, 2, 4. 



Shell depressed-turbinate or nearly planorboid, solid, heavy, um- 

 biiicate; whorls 42, the inner ones planulate, planorboid, apex 



