MOLLUSCA OR UNIVALVES. 227 



inches, but some writers speak of specimens 

 measuring four inches. 



93. Eanella. — Shell oval, rather flattened ; 

 canal short ; two rows of varices 

 situated at the distance of half 

 a whorl from each other, and 

 longitudinally united, forming a 

 continued ridge on each side of 

 the shell ; a sinus or gutter at 

 the upper part of the mouth. Animal and 

 operculum unknown. — 14 species recent, and 1 

 fossil. 



From the Indian and American Oceans, and 

 the Mediterranean Sea. 

 * 94. Mukex. — Shell oblong ; spire short ; 



channel generally long, and sometimes closed : 

 Q 2 



