205 



of that family, from which, however, the extraordinary 

 width of the aperture, and its spiral short columella >., 

 render it perfectly distinct. Shell nearly orbicular, 

 but subauriculated, and very much depressed ; left side 

 short and spiral ; spire flat; aperture oval, entire, ex- 

 tremely wide, exposing the whole interior. 



Sigaretus haliotoideus Sigaretus laevigatas 

 concavus cancellatus. 



STOMATELLA. 



PATELLA LUTE A. LllUl. 



Mart.], table \l,fiy* 154, 155. 



This genus in external appearance much resembles the 

 G. Slomatia and G. Haliotis; and Linnaeus considered 

 it a Patella, to which it has, however, less affinity than 

 to either of the other genera. It may more easily be 

 mistaken for a much depressed Turbo; but its form and 

 the want of an operculum indicate a very different in- 

 habitant. It never possesses the transversal rib of the 

 Stomatia, nor is the right margin so much raised as 

 that of the Haliotis; and it is always without the per- 

 forations, so remarkably characteristic of that genus. 



