S E C T I O N X. 197 



bellied or fwelled Whelks with a wry 

 mouth. 



This genus Is not very numerous,, but 

 fome of the fpecies are extremely large 

 and heavy. 



The fifteenth family is the Trochi, or 

 Tops. Shells of a conic or pyramidal 

 Ihape, the top being broad and flattifh, 

 and gradually tapering thence to a very 

 iharp point. The aperture or mouth is 

 moft generally angular, low, and narrow. 

 PL IlL fig. 13. a trochus. 



It is remarkable, that all the authors 

 who have wrote on Shells, agree in this 

 genus and in its charaders ; fo that few 

 Trochi are found mifplaced. 



It is a very numerous family, and abounds 

 \vith curious and fine Shells. 



There is a foiiil fpecies ofTrocluis, 

 \vhich to me feems yet undlfcovered re- 



O 3 cent. 



