TO GEOLOGY. 143 



species from the Tertiary. Sixteen are from the Subappen- 

 nines (Pliocene), twelve from Bourdeaux (Miocene), and 

 five from Paris (Eocene). In this country a single species 

 only, C. lunata (Conrad), has been heretofore observed. 

 It is from the Tertiary Beds of St Mary s. 



GENUS FASCIOLARIA. Lamarck. 



F. plicata. Plate 5. Fig. 142. 



Description. Shell subfusiform, turrited, largely and 

 longitudinally folded, transversely and alternately striate ; 

 suture irregularly impressed ; whorls eight, convex ; colu- 

 mella with two small folds ; canal short, reflected; mouth 

 ovate, two fifths the length of the shell ; outer lip sharp, 

 within striate. 



Length .7, Breadth 7-20ths, of an inch. 



Observations. A very pretty species, remarkable for its 

 large folds and well marked transverse striae, which are 

 alternately larger and smaller. The striae within are 

 strongly marked. 



F. elevata. Plate 5. Fig. 143. 



Description. Shell subfusiform, turrited, transversely 

 striate on the inferior part of the last whorl ; suture linear ; 



whorls , slightly convex, truncate along the suture ; 



columella with three or four indistinct folds ; canal short, 

 slightly reflected ; mouth ovate ; outer lip sharp, within 

 crenate. 



Length .... Breadth 3-20ths. of an inch. 



