TO GEOLOGY. 175 



V. Parkinsonil* Plate 6. Fig. 184. 



Description. Shell subturbinate, very closely covered 

 with minute, transverse striae ; substance of the shell rather 



thin ; spire ; suture linear ; whorls , flattened 



above ; mouth rather contracted ; columella with four 

 folds ; outer lip sharp. 



Length .... Breadth .4, of an inch. 



Observations. This very closely resembles the last spe- 

 cies. It differs in being less turbinate, in having more 

 closely set striae, and in having one tooth less in number. 

 Unfortunately, I have but one specimen, and that with the 

 spire removed. The relative character of four or five folds, 

 in this and the last described, may differ in other individu- 

 als. The species are, nevertheless, distinct. 



V. CooperiiJ Plate 6. Pig. 185. 



Description. Shell pyriform, inflated, obtusely angular 

 above, furnished on the inferior part with about ten distinct, 

 oblique, distant striee ; substance of the shell somewhat 

 thick ; suture small and subgranulate ; spire very slightly 

 elevated, rounded at the apex ; whorls flattened above ; 

 canal very short and wide ; columella with five folds ; 

 mouth long and lunate. 



Length 1.2, Breadth .9, of an inch. 



* Named after the author of " Organic Remains" and " Outlines of 

 Oryctology." 



t Named after my friend, William Cooper, distinguished for his know- 

 ledge in natural science. 



