118 CONCHOLaGY. 



whorls often surmounted by spires ; aperture oval, entire ; 

 columella smooth and arched ; closed by a thin, horny, com- 

 plete operculum. 



Melania asperata. Melania decollata. 



M. truncata. M. amarula. 



M. coarctata. M. thiarella. 



M. punctata. M. spinulosa. 



M. corrugata. M. granifera. 



• M. subulata. M. carinifera. 



M. Iffivigata. M. truncatula- 



M. clavus. M. fasciolata. 



M. amarula. The crowned Melania. PI. 20, fig. 3. 



Covered with a black epidermis, under which the colour 

 is deep chestnut ; ovate oblong, with the whorls transversely 

 keeled and coronated with triangular tubercles, from which 

 emanate ciliated spines. 



2. Melanopsis. Three species. 

 The shells of this genus are fluviatile, and distinguished 

 from the Melania by having the upper part of the columella 

 callous. 



Shell oval or slightly sub-turriculated ; aperture oval, 

 without trace of tube, but hollowed anteriorly, without a 

 posterior sinus ; the columellar edge callous and rather deep- 

 ly excavated ; operculum horny, sub-spiral, rather complete. 

 Melanopsis Buccinoides. Melanopsis costata. 



M. laevigata. 



M. Buccinoides. The Buccinum-shaped Melanopsis. PL 

 20, fig. 6. 



Species turriculated ; colour bluish white, clouded with 

 purple; spiral whorls dentated. 



M. costata. The ribbed Melanopsis. 

 Species sub-turriculated and ribbed. 



M. IcEvigata. The polished Melanopsis. 

 Species ovate, smooth, chestnut colour. 



