COCHLEA. ] 97 



membranacea, Low*. sarcostoma, Webb and Berth. 



modesta, Ferns. Saulcyi, D'Orb. 



nivosa, Sow. simia, Fer. 



plectilis, Bern. undata, Lowe. 



plicaria, Lam. vulcania, Lowe. 

 Porto-Sanctana, Sow. 



Sub-gen. otala, Schumacher (Thelidomus, Swains. Pachystoraa, 



Albers). 



Shell imperforate, very rarely narrowly umbilicatecl, solid, 

 depressly-globose ; spire short, obtuse, last whorl protracted at 

 the aperture, gibbous, deflexed, often obtusely angulated ; aper- 

 ture narrow, irregularly lunar ; peristome thickened, the margins 

 joined by a callus, the basal often denticulate or acutely callous. 



angustata, Ferns. lima, Ferns. 



aspera, Ferus. orbiculata, Ferus. 



auricoma, Ferus. Petitiana, D'Orb. 



Bonplandi, Lam. Poeyi, Petit. 



caelatura, Ferus. Sagraiana, D'Orb. 



crassilabris, Pfeiff. sobrina, Ferns. 



discolor, Ferus. Spengleriana, Pfeiff. 



incerta, Ferus. supertexta, Pfeiff. 



Sub-gen. parthena, Albers. 



Shell imperforate, thin, depressed or globosely-depressed, last 

 whorl ventricosely convex at the base ; aperture large ; columella 

 vertical, intrant; peristome simple, acute. 



angulata, Ferus. Natalensis, Pfeiff. 



irradiata, Gould. tenerrima, C. B. Adams. 



Sub-gen. dialeuca, Albers. 



Shell imperforate, depressly turbinate, flattened at the base, 

 last whorl obtusely angulated ; columella intrant, very oblique, 



VOL. II. D D 



