PATELLA. 5 
tracted like a scoop; summit acute; margin 
slightly angular; greyish or brownish white, and 
the inside white, with a dark horse-shoe-like 
mark environing the muscular impression. 1} 
pete W372 40. 
P. compressa. Oblong, slenderly striated 
longitudinally, tawny yellow; sides compressed, 
and summit beaked. 1}...2. W. 37. 53. 
P. GRANULARIS. Ovate, brown, with narrow 
ribs provided with white granulations; inside 
whitish, slightly pearly ; muscular impression 
yellowish; summit not central. 13...g. W. 
3/. 26. 
P. peAuRATA. Oval, with numerous sub- 
nodulous obtuse ribs, and somewhat imbricated 
transverse wrinkles; margin plaited, brown with- 
out, silvery within, and the muscular impression 
bronzed. 13...1. 
P. vunearis. Sub-oval; many sub-angular 
ribs, and intermediate strie, greenish or yellowish 
