who informs me that that they were found with the prece^ 

 ding by his friend Mr. Janin in the Bayou Teche. 



It resembles purpureus, Nob., but in that species the 

 cardinal teeth are direct, and a remarkable feature is ex- 

 hibited by this shell in its anterior rectilinear declivity, ter- 

 minating below the anterior middle in a kind of rostrum 

 or prominent angle, which may be compared to that of 

 nasutus^ N. excepting that it is nearly on a line with the 

 base. I have not seen any variety of either of those spe- 

 cies that could be mistaken for this. The beaks and um- 

 bones in my specimens are very much eroded, exposing a 

 wax coloured surface. 



REFERENCE TO THE PLATE. 



The plate repreGcnts exterior, interior, and backviewe. 

 P! 35. 



