MANUAL OF THE MOLLUSCA. 



Distribution, 14 species. Australia, Borneo, Philippines, China, 

 Cuba. 



Blathsteria, Shuttleworth, 1854. 



Dedicated to M. Blauner. 



Type, B. pellucida. Cuba, Jamaica, Florida, and Porto Rico. 



Shell somewhat resembling Achatina, imperforate, oblong- 

 turreted, thin ; aperture narrow, elongated ; body of the penul- 

 timate whorl bearing a single plait near the columella, which is 

 rather truncated ; peristome simple, straight. 



Animal showing the characters of the family of the Auriculidos, 

 not of Helicidce. 



Distribution, 2 species. "West Indies, Sandwich Islands. 



Stolidoma, Deshayes, 1864. 



Type, S. crassidens, Deshayes. 



Shell oblong, turriculated, subcylindrical ; apex obtuse, 

 smooth polished ; aperture elongated, obliquely inflected, 

 narrowed behind, widened in front ; columella straight, with 

 a large median plait, compressed, and slightly oblique. 



Distribution, 3 species. Eocene. Paris basin. 



The shells of this genus are Auriculae, with a single columella - 

 plait, without teeth or plications on the right lip. 



Cakychitjm (see p. 305). 

 Zospetjm, Bourguignat, 1860. 

 Shell like Carychium ; tentacles four ; eyes absent. 

 Distribution, 1 1 species. Inhabiting the subterranean grottoes 

 of Carniola. The animal is most active during the winter, at 

 which time they propagate. 



Otina (see p. 238). 

 This genus is the type of a sub -family which has nearly the 

 same relation to Auriculinae as Ancylus to Limncea. 



Distribution, 3 species. Britain, United States, Benguela. 



Family VI. — Cyclostomld^;.* 

 Cyclo stoma (see p. 306). 



Sub-genus : — Cyclotopsis, Blanford, 1864. 

 Type, C. semistriatus, Sow. 



Shell umbilicated, depressed, spirally striated ; aperture 

 snbcircular ; operculum concentric, multispiral, internally 

 membranous, externally shelly ; margins of the whorls raised. 

 Distribution, 5 species. India, Seychelles, Mauritius. 

 * See p. 306. 

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