228 



Cerithium subulatum Cerithium ocellatum 



heteroclites Hteratum 



zonale [um atratum 



semiferrugine eburneum 



torulosum - punetatum 



tuberculatum lima 



morus perversum. 



[And sixty fossil species.] 



PLEUROTOMA. 



MUREX BABYLONIUS. LinnCBUS. 



Mawes Linnaus, pi. 26, Jig. 1. 



These shells were considered Murices by Linnaeus, 

 and Bruguiere confounded them with the G. Fusus; 

 they are however very different from either, not hav- 

 ing the varices of the Murex, and possessing a long, thin 

 notch or slit, on the right side of the aperture, which 

 does not exist in the Fusus. Lamarck in the first in- 

 stance called all these shells having a short canal Cla- 

 vatulae, and those with a long canal Pleurotomae; but 

 the very variable length of canal in the intermediate 

 species, induced him to class them all under the present 

 genus, being only guided by the notch on the upper 



