to Volvaria ; but the shells of that genus are emarginate at 

 base. 



BULLINA CANALICULATA. 



DESCRIPTION. 



Shell white, immaculate, cylindric, with very minute, 

 obsolete wrinkles : spire convex, a little elevated, mammi- 

 lated at tip : volutions about five, with their shoulder very 

 obtusely grooved : labrttm with the edge prominently and 

 obtusely arquated : labium overspread with a calcareous la- 

 mina, and with a single fold or oblique tooth near the 

 base. 



SYNONYM. 

 VOLVARIA CANALICULATA, Nob. Joum. Jlcttd, Nut. Sc. Vol, 



5,p, 211. 



OBSERVATIONS. 



This genus has been constructed subsequently to the 

 publication of my description of the above species. 



Two specimens of the shell were sent to me by the late 

 Mr. Stephen Elliott, from the coast of South Carolina, 

 The arquated form of the edge of the labrum is very obvi- 

 ous when viewed in profile. 



In comparison with a fossil shell of Dax, sent to me by 

 Mr. Hoeninghaus ofCrefeld under the name of B. lajonhei- 

 riana, Easter, before mentioned, it is a little larger, and 



