J 8 NEW SPECIES OF SHELLS. 



In the collection of the Academy* 



This species appears to be somewhat allied to the H. 

 hispida^ but is suificiently distinct. Found by Mr. Lard- 

 ner VanuK:em. 



H, perspectiva. Shell very much depressed, with 

 about six whorls; whorls striated across, with raised, pa- 

 rallel, acute lines, forming strongly impressed sulcae be- 

 tween them. Umbilicus very large, resembling an in- 

 verted spire, in diameter at leyst equal to the breadth of 

 the body whorl, and exhibiting distinctly all the volu* 

 tions. Diameter three-tenths of an inch. 



Found by Mr. Le Sueur, near Lake Erie. 



JI, lineata. Shell very much depressed, somewhat 

 discoidal. Whorls about four, each longer than broad, 

 with numerous, raised, parallel, equidistant, regular, re- 

 'volving lines. Suture impressed. Umbilicus very large, 

 diameter at least equal to the breadth of the body whorl, 

 and exhibiting all the volutions distinctly. Aperture 

 longer than wide, lunate. Diameter three -twentieths of 

 an inch, nearly. 



Collection of the Academy, 



Found by Mr. Robert E. Griffith, near Philadelphia, 

 Somewhat resembles the last, but is more depressed, and 

 the striae are transverse, not longitudinal as in that shell; ^ 

 the cavity beneath also, though of equal proportional di- 

 ameter, is not proportionally deep. 



