184 CONTRIBUTIONS 



O. Phillipsii.* Plate 6. Fig. 199. 



Description. Shell ovately-fusiform, polished ; substance 

 of the shell rather thick; spire elevated, somewhat turrited; 

 whorls six, flattened above ; columella with three or four 

 oblique folds at the base ; mouth somewhat narrow, rather 

 more than one half the length of the shell. 



Length .6, Breadth 5-20ths, of an inch. 



Observations. Differs from the other species here de- 

 scribed, in being wider in proportion to its length, and 

 having the spire somewhat turrited. This character is 

 caused partly because there is no deposit along the canal. 

 I have seen no other species among the foreign or Ameri- 

 can fossil Olivw, without this deposit. 



O. minima. Plate 6. Fig. 200. 



Description. Shell ovate ; substance of the shell thin ; 

 spire short and obtuse ; whorls four, rather convex above ; 

 columella with about six equidistant folds extending high 

 up ; mouth long, narrow and curved, being four fifths the 

 length of the shell. 



Length .2, Breadth .1, of an inch. 



Observations. This very small species differs from those 

 above described, in the spire being short and obtuse, and 



* Named after one of the distinguished authors of " Outlines of the 

 Geology of England and Wales." 



