CISTULA. 293 



clathratulus, Recluz. Philippianus, Pfeiff. 



clausus, Sow. politus, Sow. 



Guillaini, Petit. pygmseus, Sow. 



hrernastoma, Anton. spurcus, Gratel. 



Listeri, Gray. unifasciatus, Sow. 



multilineatus, Jay. vitellinus, Pfeiff. 

 naticoides, Beclnz. 



Sub-gen. leonia, Gray. 



Operculum externally very convex, composed of a single 

 whorl; nucleus placed near the columellar margin. 



Shell ovate, conical ; aperture oval ; peristome simple, slightly 

 reflexed. 



mamillaris, Lam. 



Genus CISTULA, Humphrey. 



Operculum ovate, thin, cartilaginous, with a very thin, 

 external, shelly coat ; whorls few, gradually-enlarging, flat,, 

 their edges simple, generally free, centre rather concave ; 

 nucleus excentric. 



Shell glohosely conical or ovate, or oblongly turreted, 

 generally truncated; aperture oval or sub-circular; peri- 

 stome double, or simple and expanded. 



Ex. C. catenata, Gould, pi. 86, fig. 10. Operculum, C. 

 catenata, fig. 10, a, 10, b. 



With scarcely a single exception, this group is from the 

 West Indies and South or Central America, most of the 

 species coming from Cuba and Jamaica. 



Species of Cistula. 



Agassizii, Charp. bilabiata, D'Orb. 



ambigua, Lam. bilabris, Mke. 



VOL. II. Q Q 



