rSEUDOTROCIIUS. 135 



Species of Columna. 

 exiinia, Shuttl. flammea, Martyn. 



Sub-gen. rhodea, H. and A. Adams. 



Shell thin, dextral, clausiliafonn ; last whorl flattened, the 

 base acutely carinated, excavated beneath ; columella arcuated, 

 thickened, sub-truncate. 



Californica, Pfeiff. 



Genus PSErDOTROCHUS, Klein. 



Shell solid, ovately elongated ; apex acuminated, whorls 

 7 8, the last about equal to 3 of the length ; columella 

 narrow, distinctly truncated in the adult ; aperture lunately 

 oval, suh-angulated; peristome straight, acute, the margins 

 united by an intrant callus. 



Syn. Chersina, Humph. Liguus, Montf. 



Ex. C. alabaster, Rang, pi. 73, fig. 8. Shell, C. vir- 

 gineus, Linn ecus, fig. 8, a. 



The species of this genus are West Indian, coming from 

 the Islands of Cuba and Haiti. 



Species of Pseudotroclms. 



alabaster, Banff. fasciatus, Midi. 



balteatus, Gould. lineatus, Valeric. 



Blainianus, Poey. murreus, Reeve. 



carinatus, Pfeiff. pictus, Peeve. 



crenatus, Swains. Solimanus, Morel. 



emarginatus, Suains. virgineus, Linn. 



