PATELLA. 



tracted like a scoop ; summit acute ; margin 

 slightly angular ; greyish or brownish while, and 

 the inside white^ with a dark horse-shoe-like 

 mark environing the muscular impression. If 

 ...li. W. 37. 40. 



P. COMPRESSA. Oblong, slenderly striated 

 longitudinally, tawny yellow; sides compressed, 

 and summit beaked. 1^ . . . j. W. 37. 53. 



P. GRANULARis. Ovatc, brown, with narrow 

 ribs provided with white granulations; inside 

 whitish, slightly pearly ; muscular impression 

 yellowish; summit not central. I3...I. W. 

 37. 26. 



P. DEAURATA. Oval, with uumerous sub- 

 nodulous obtuse ribs, and somewhat imbricated 

 transverse wrinkles ; margin plaited, brown with- 

 out, silvery within, and the muscular impression 

 bronzed. H . . .1. 



P. VULGARIS. Sub-oval; many sub-angular 

 ribs, and intermediate striae, greenish or yellowish 



