20Z C O N C H O L O G Y. 



lea fnails. Gualtieri, like Lifter, places 

 many among theland and river Shells ; and 

 the fea ones he ranks as Cochlea depreflae. 

 Argenville and Davila place them with 

 the Cochleae ore depreflb, or Trochi ; and 

 the other authors rank them indifcrimi- 

 nately with Snails, by the names of Port- 

 horns and Lamps. 



There are many curious fpecies of this 

 genus. 



The third genus of Snails has a very fhort, 

 or but little produced turban, (Clavicula 

 breviore) and that is their only charadler, 

 they agreeing in the mouth and other par- 

 ticulars with the reft. Indeed, I have formed 

 this genus more for regularity and clearnefs 

 in the method, than on account of its hav- 

 ing any effential diftincl character; and in 

 moft authors they are indifcriminately in- 

 termixed with all the Snail kind. PI. IIL 

 fig. II, theumbilicated whitifti thin Snail. 



However, 



