202 



C. with a very pale, purplidi, flefli-coloured fliell, much 

 like the preceding, but fnialler and deftitute of fpots. 



Whether this is really a diftinft fpecies, or only the 

 young, or variety of the other, is very difficult to deter- 

 mine: all we can fay is, that it is more common on our 

 fliores, and is frequently found where the other is not; 

 and in fome places, where the other is dredged up alive, 

 we have not been able to procure a lingle fpecimen of 

 this. It mufl:, however, be remarked, gradations are 

 fometimes ohferved, that run fo much into each other, as 

 to create ftrong fufpicion of this being the fame fpecies. 



It was feparated by Doctor Sol/^nder, who gave it 

 the name we have here prefixed to it, in the Mufeuin 

 Portlandicum. 



3. 

 BuLLATA. C. with a thin, pellucid, white fiiell, in fliape much 



Tab. 6. f. I. like the C. Fediculus ; fome are quite deffitute of tranf- 

 verfe flriie; others are faintlv ilriated halfway from the 

 back to the inner lip, the other half to the outer lip mark- 

 ed with extremely fine longitudinal firias : the margin of 

 the outer lip is not thickened, the edge finely crenated : 

 the inner lip. even of thofe which are quite fmooth, is a 

 little denticulated: iht apex is fomewhat produced and 

 formed into two or three fmall convolutions : in fome the 

 volutions are well defined by a feparating line, in others 

 they are nearly even. 



Doaor 



