81 



C. with a fub-oval (hong fhell, flriated longitudinally ; 

 covered by a glofTy yeilowifh-brown epidermis, which 

 renders the ilria^ nearly obfolete; a fewir regular, con- 

 centric wrinkles are alfo obfervable: beneath the epidermis 

 the fhell is of a flefh colour. Infide fmooth, glofTy, white ; 

 marsrin denticulated. Length two inches and a half; 

 breadth two inches. Young fhells beautifully polilhed 

 and mottled with reddifh-brown, or pink ; infide pink, 

 except at the margin, where it is broken into fpots in 

 fonie, in others plain white. 



This fpecies is found on many parts of our coaR, but 

 is not commonly met with in a living or recent flate. 



We have frequently taken it by dredging in Salcomb • 

 bay. 



6. 

 C. with a flat, fub orbicular fliell; colour rufous-white. Nodosum. 

 with twenty four ribs covered with clole-fet, obtufe tu- 

 bercles. Infide white, glofTy ; margin flrongly denticulated. 



We found this new fpecies fparingly amongff fand from 

 Falmouth harbour. Diameter three-quarters of an inch. 



Although this ffiell bears fome refemblance to the 

 young echinatuvi, it muff not be confounded; the young 

 of that fpecies is always more globofe, or convex ; the 

 ribs are more fharp, and the tubercles more pointed and 

 diftant. 



M C. wiib 



