MELANOPSIN^E. 309 



Ex. P. Helvetica, Michelin, pi. 32, fig. 7. 



The curious little shell on which this genus is founded 

 inhabits the fresh-water streams of Switzerland, and is re- 

 markable for its white colour and the carinated nature of 

 the whorls. 



Sub-fam. MELANOPSINJE. 



Operculum ovate, subspiral. 



Shell covered with an epidermis ; aperture with a dis- 

 tinct notch in front. 



Genus MELANOPSIS, Ferussac. 



Shell ovate, last whorl elongated, smooth, or longitudi- 

 nally plicate ; spire short, acute ; aperture oblong, dis- 

 tinctly notched in front ; inner lip thick, with a callus 

 posteriorly ; outer lip simple, acute. 



Syn. Faunus, Megerle, not Montf. Campeloma, Rajin. 

 Ceneona, Gist. 



Ex. M. costata, Olivier, pi. 32, fig. 8. Operculum, M. 

 praerosa, Linnceus, fig. 8, a, 8, h. 



This genus was established by Ferussac for the species 

 of Melaniid(B which have the columellar lip callous, and 

 a notch at the fore part of the aperture ; it is distin- 

 guished from Faunus in the outer lip not being produced 

 and sinuated, and in the general form of the shell. 



Species of Melanopsis. 



acicularis, Feruss. praerosa, Linii. 



deuegabilis, Feruss. trifasciata, Gray. 



Esperi, Feruss. variabilis, V. d. Busch. 



maculata, Lea. Zealandica, Gould. 



