VIBEX. 



303 



This genus comprises many fine species of fresh water 

 shells, principally from South America, though a few 

 have been regarded as inhabitants of other countries. 



Species of nemisinus. 



adspersus, Trosch. 

 Braziliensis, Moric. 

 breviformis, PJiil. 

 bulbosus, Gould. 

 contractus, Lea. 

 conus, Jacq. 

 clermestoideus, Lea. 



Edwardsii, Lea. 

 Guayaquil ensis, Petit. 

 Hugelii, Phil. 

 lineolatus, Wood. 

 perfuscus, Lea. 

 rugiucsus, Lea. 

 symmetricus, Conr. 



Genus VIBEX, Oken. 



Shell turreted, whorls tuberculated, spirally ridged or 

 muricate ; aperture subcircular, produced and broadly 

 channelled in front ; outer lip thin, simple. 



Si/n. Claviger, Held. Melania, Swains., not Lam. 



Ex. V. aurita, Midler, pi. 32, fig. 3. Operculum, V. 

 aurita, fig. 3, a, 3, h. Shell, V. aurita, fig. 3, c. 



In this genus the shell is usually rather thick and solid, 

 and the columellar lip is somewhat excavated and flat- 

 tened anteriorly, the whorls, moreover, are usually rough 

 with tubercles or elevated ridges. 



Species of Vibex. 



aurita, Midi. 

 balteata, Phil. 



fusca, Gmel. 

 tuberculosa, Pang. 



UJ 



L I 3 R A ?^ "I 





u.&ty. 



