CUh 



«Aut&~ 



An account of some of the Marine Shells of the 

 United States. By Thomas Say. 



[continued from page 248.] 



3. #pusilla. Shell thin, suboval, cinereous or 

 rufous, with sometimes one or two obsolete, dilated, 

 revolving bands ; columella callous ; callus pressed 

 laterally into the umbilicus, whitish; umbilicus near- 

 ly closed and consisting only of an arquated, linear, 

 vertical aperture. 



Length about a quarter of an inch. 



Inhabits the southern coast. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



A small species, generally mistaken for the young 

 of one of the preceding species. 



THEODOXUS, Montf 

 Species. 



N. *reclivatus. Shell thick, strong, globose-oval, 

 greenish-olive, with numerous, approximate, parallel, 

 irregularly undulated green lines across the volu- 

 tions; volutions about three, the exterior one occu- 

 pying nearly the whole shell ; spire very short, ob- 

 tuse at the apex, and frequently eroded to a level 

 with the superior edge of the body whirl ; mouth 

 within bluish-white ; labrum acutely edged ; labi- 

 um callous, minutely crenated on the edge, and with 

 a very small tooth near the middle. 



Greatest diameter nineteen-twentieths of an inch, 

 greatest transverse diameter four-fifths of an inch. 



Inhabits East Florida. 



32 



