46 HELICID^. 



simple, the margins joined by a thin callus, the eolumellar mar- 

 gin dilated, reflected. H. Falconari, Reeve. 5 sp. Australia, 

 Madagascar, India. 



STYLODONTA, Crist. ct Jan., 1837. ( Columplica, Mousson, 1844.) 

 Shell imperforated, conoidal above, globose below ; whorls six or 

 seven, tlie last ventricose ; aperture somewhat narrow, oblique; 

 columella short, nearly direct, dentate and truncate ; peristome 

 thin, reflected at the base, extremities united hy a very thin 

 parietal callus. H. cepoides, Lea (xcvi, 83). 4 sp. Seychelles 

 and Philippines. 



EREPTA, Albers, 1850. Shell imperforate, rather depressed, 

 solid, the last whorl subangulated ; columella short, oblique, 

 truncate, with a strong tooth; peristome simple, the basal margin 

 somewhat thickened. H. Stylodon, Pfr. (xcv, 71). 13 sp. 

 Mauritius. 



cocHLOSTYLUS, Fer., 1819. (Bulina, Lesson, 1831. Helicostyla, 

 Morcli, 1865. Cochlostyla, Issel, 1874.) Shell not umbilicated, 

 oval, conical, subbulimiform, ventricose ; apex somewhat obtuse; 

 aperture large, ovate ; columella straight, sometimes slightly 

 arcuated; peristome wide, reflected. 214 sp. Philippines, etc. 



Axina, Albers, 1850. Shell imperforated, usually covered by 

 a transparent, caducous epidermis, depressed or subtrochiform ; 

 whorls four or five, flattened, the last carinate on the periphery ; 

 aperture securiform ; columella short, callous, oblique ; peristome 

 labiate, reflected at the base. H. siquijortnsia^ 13rod. (xcvi, 97). 

 10 sp. Philippines. 



Pfeifferia^ Gray, 1853. (Named after Dr. Louis Pfeiffer, 

 author of Monogiaphia Heliceorum Yiventium, etc.) Shell 

 globular, imperforate, thin, fragile, white, pellucid ; spire not 

 prominent, the last two whorls very large, forming nearly the entire 

 shell ; aperture rounded ; lip thin, sharp. Animal too large for 

 complete retraction within the shell ; mantle-margins reflected 

 upon a part of the surface of the shell and forming a border on 

 the peristome ; foot moderate, depressed and attenuated poste- 

 riorly, and without muciparous gland, H. micans (xcii, 75, 76) 

 occurs on the leaves of bushes in the Island of Luzon. 2 sp. 

 Philippines. 



Ghloreea, Albers, 1850. (Thersites, Morch, 1865.) Shell 

 shining, imperforate, flattened, globosely depressed or lenticular ; 

 whorls four or five, the last angular or carinated ; aperture 

 oblique, nearly horizontal, elliptical ; peristome sharp, the 

 extremities approaching, the basal lip widened, reflected. H. 

 fibula^ Brod. 10 sp. Philippines. 



Corasia, Albers, 1850. Shell imperforate, depressed, rarely 

 orbicularly^ conic, thin, diaphanous, flattened above, rounded 

 below ; whorls 4-6, the last very often angulated or cari- 

 nated ; aperture oblique, angular, large ; columella intrant, thin, 



