CONCHOLOGY. 



Although we have every reason for believing this shell to be 

 perfectly undescribed, we should not pass silently over another shell 

 which bears a near approximation in the general aspect, at least of 

 its dorsal surface, but which from the structure of the mouth is ob- 

 viously distinct; we allude to the Purpura bicostalis of Lamarck, the 

 mouth of which is not rounded and entire as in Turbo Zebra : it is 

 somewhat produced, or beaked, and being furnished at the base of 

 the mouth with a short canal or groove, belongs in reality, in the 

 Linnaean arrangement, to the genus Buccinum. 



