196 



POPULAR CONCHOLOGY. 



This very extensive genus has been divided into as 

 many as twenty-seven genera, by continental and English 

 writers, as follows : — Cyclotus Guilding ; Pterocyclus 

 Benson ; Craspedopoma Pf. ; Aulopoma Troschel ; Cy- 

 clophorus Montf. ; Leptopoma Pf. ; Alycaeus Gray ; 

 Deplommatina Benson ; Megalomastoma Sw. ; Cataulus 

 Pf. ; Pupinella Gray ; Rhegostoma Ag. ; Jamaicia Adams ; 

 Licina Gray ; Choanopoma Pf ; Adamsiella Pf ; Lithi- 

 dion Gray; Otopoma Gray; Cyclostoma Lam.; Tudora 

 Gray ; Leonia Gray ; Cistula Gray ; Chondropoma Pf ; 

 Pomatias Studer ; Realia Gray ; Omphalotropis Pf ; 

 Bourciera Pf 



Ferussina. Grateloup. (StrophostomaZtes/i.) 

 — Shell egg-shaped, or tolerably globular : the 

 aperture oblique, simple edged, untoothed, 

 turned up towards the spire, and the edge 

 thickened ; a wide or narrow umbilicus. — 

 Fossil. 



These shells seem to be to Cyclostoma, what Fermsina. 

 the Anastoma is to Helix. 



Ptjpina. Vignard. — Shell cylindrical, somewhat tur- 

 reted, highly polished, the spire more or less de- 

 pressed, and obtuse ; the last whorl but one 

 usually inflated, the last a little contracted ; aper- 

 ture nearly circular; the outer lip thickened, a 

 little reflected, and generally cut near the inner XuncziL 

 lip, with a small canal; operculum horny, and spiral.* 

 Animal not known. — 12 species. 



Beautiful little shells from the Philippines, New Guinea, 

 &c, with a very polished exterior, and often quite trans- 

 parent, 



* Reeve's Iconica. 



