the canal livid ; colour dusky oi blnckish. the inlerstic^psot 

 the stria often whitish, with a white superior margin to 

 the whorls. 



From Mr. Elliott. It is a very pretty shell, inhabiting 

 the southern coast of Florida. I think that it approaches 

 C. zonale, Brug. though it does not perfectly agree w^ith 

 Lamarck's description, particularly in not being "longitu- 

 dinaliter obsolete plicate," for the folds in our shell are so 

 prominent and robust as to deserve the name of ribs. 



It seems probable that Lister's figure 81, of pi. 1018 is 

 intended for this shell ; to which figure Gmelin gave the 

 name of Murex minimus. This practice of naming fig- 

 ures of older authors, I conceive leads to error, and ought 

 to be condemned by every modern naturalist. 



REFERENCE TO THE PLATE. 



Fi^. y, front view, enlarged. 



f/, natural length. 

 Fl 49. 



CERITHIUM FERRUGINEUM. 



■ ly SPECIFIC CHARACTHR. 



Pale ferruginous, granulated l)y longitudinal ribs and 

 transverse striae 



