203 



A LIST OF THE 



SPECIES OF FOSSIL SHELLS 



Particularized by Le Chev. de Lamarck, in Les Annales du Musee, 

 and Histoire Naturelle des Animaux sans Vertebres ; with a spe- 

 cification of their most distinguishing characters. 



Note. When the size of the shell is mentioned, it is to be taken as 

 generally meaning the larger size : by small, is meant less than half an 

 inch ; and, by very small, less than a quarter of an inch. 



Chiton. 



Grigmnensis. . octovalvis ? 

 Patella. 



elongata. . obtuse, radiated, apex much inclined. 



dulcis. . subconical, apex inflected. 



scutatella. . very small, apex central. 



dilatata. . rugose, depressed. 



cornucopia. . obliquely conical, impression semicircular. 



spirostris. . rudely striated. 



retortella. . spire obliquely lateral. 



pennata. . subimbricated posteriorly. 



squamaeformis. . flattish and smooth. 



Fissurella. 



labiata. . subsquamose, striae decussating. 

 Emarginula- 



costata. . ribbed longitudinally, apex hooked. 

 clypeata. . cancellated, back grooved. 

 radiola. . with radiating costulae. 



Calyptraea. 



trochiformis. . echinated, apex subcentral. 

 crepidularis. . subovate : var. of former ? 



Conus. 



antediluvianus. . long, spire pointed, wreaths crenulated. 

 deperditus. . spire not much raised, the wreaths not crenulated, 



but grooved on the top. 

 turritus. . subfusiform, whirls oblique. 

 stromboides. . spire obtusely nodose, whirls obtuse. 

 antiquus. . dilated upwards, lip bowed, spire smooth, slightly 



canaliculated 3| inches. 

 Betulinoides. . oblongo-conical, smooth, spire convex, pointed, 



base rounded 4 inches. 

 clavatus. . conico-clavated, striae longitudinal and bowed, spire 



elevated, rather pointed, wreaths convex 3 inches. 



