12 PUPID^. 



J 2). 85 sp. Europe, N. Africa, East and West Indies, Poly- 

 nesia, United States. 



VERTiLLA, Moquin-Tandon, 1855. V. pusilla. Miill. (c, 13). 

 15 sp. Europe, Australia, Sandwich Isles, etc. 



ISTHMIA, Gray, 1821. (Truncatellina and Paludellina, Lowe, 

 1852. Edentulina, Clessin.) Shell cylindrical, sumniit obtuse, 

 striated, whorls flattened; aperture semioval, edentulous; lip 

 thin, slightly reflected. P. columella^ Mart, (c, 9, 10). 21 sp. 

 Europe, Africa, etc. 



FAULA, H. and A. Adams, 1855. (Fauxulus, Schauf., 1869.) 

 Shell sinistral, oval-conic, smooth ; spire conical or subcylm- 

 drical,apex pointed ; whorls flattened, the last narrowed towards 

 the base ; aperture semioval, plicate within the outer and on 

 the parietal wall ; peristome simple. P. Capensis, Kurr. (c, 100). 

 S sp. Cape of Good Hope. 



ZosPEUM, Bourg., 1856. 



Distr. — 10 sp. Caverns in Carniola and Spain. Z. spelseum, 

 Rossm. (c, 14). 



Shell minute, subhyaline, pupiform, umbilicated, spire obtuse ; 

 aperture usually with columellar and parietal plicae, sometimes 

 edentulous. 



The members of this group are met with in caverns and other 

 places from whence the light is excluded. Bourguignat, in con- 

 sequence, supposes that they are without the usual organs of 

 vision ; four tentacles. The ]30sition of this genus is somewhat 

 doubtful ; some conchologists are inclined to place it near Carj'- 

 chium, which its radula resembles. 



Strophia, Albers, 1850. 



Syn. — Cerion, Morch, 1852. 



Distr. — 35 sp. West Indies, Florida, Bahamas. S. uva, Linn, 

 (c, 15). S. chrysalis, Fer. (c, 16). 



Shell large, pupiform, or cylindrical, with obtuse apex ; striate 

 or costate, rimate; aperture oval, with plicate columella and 

 expanded lip. 



Inferior tentacles very short ; jaw finely striated with a median 

 projection; dentition resembling Helix. 



Megaspira, Lea, 1834. 



/Si/n.— Pyrgelix, Beck, 1837. 



Distr. — 2 sp. Forests of Brazil. Fossil, Eocene of Paris 

 basin. M. elatior, Spix (c, IT). 



Shell elongated, attenuated to an obtuse apex, multispiral ; 

 whorls about twenty -five in number, flattened, slowly increasing, 

 costulate ; aperture small, rounded, angular behind ; columella 

 with transverse dentiform plications ; peristome simple. 



