CORBIS. 



5/^ Jimhriata of Cuvier, and according to Lamarck, an in* 

 habitant of the Indian ocean. Two fossil species are des- 

 cribed by Lamarck^ both of which are found in the more 

 recent formation above the chalk, one at Grignon, and 

 the other at Granville. Neither of them are so gibboua 

 as the recent one. 



Whether the shells of this Genus be covered with an 

 epidermis in their natural state or not, we have no means of 

 ascertaining ; there is, however, some reason for believing" 

 this to be the case. 



