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TERTIARY FAUNA OF FLORIDA 



malaw Sound, South Carolina ; living at Jamaica in the Antilles and on the 

 coast of Texas. 



This is a well-characterized species, notable for its microscopic shagreening 

 on the posterior slope and the compression or subrostration of the same part 

 of the shell. It is abundant at Simmons Bluff, and specimens of the same size 

 are absolutely identical with specimens of soror named by and received from 

 Professor Adams. 



The D. orbella Gould, a recent species of the Pacific coast, has been errone- 

 ously referred to Sphcerella by Conrad, and the name has been incorrectly used 

 for a Pliocene species of Costa Rica by Gabb. Venus ascia H. C. Lea (1845), 

 from the Miocene of Petersburg, Virginia, has the aspect of a much dilapidated 

 Felaniella, but the type valve is so poor that its systematic position cannot be 

 decisively fixed. 



