MONOGRAPH 



OF THE 



GENUS ANCULOTUS OF SAY. 



ANCULOTUS. 



GENERIC CHARACTER. 



Shell suboval, rarely conical; spire generally de- 

 pressed; aperture siiborbicular or obovate, rounded 

 at base; base of the columella rounded or obtusely 

 angulated; 'columella wide, thickened, polished, gene- 

 rally with a callus near its superior junction with the 

 labrum. 



OBSERVATIONS. 



Mr. SAYjWith hisusual discrimination, has separat- 

 ed this natural group of shells from the genus Melania, 

 from which they differ in their obtusely rounded base, 

 and generally by their depressed form, several spe- 



