79 



twenty ; in this particular both may be right, for in fome 

 the fide ribs are fcarcely defined but by rudiments of 

 the fpines. 



This is common on mofl of our fhores, and very nu- 

 merous in fome places, mofily worn and bleached white : 

 live fliells are rarely obtained but by dredging : in this man- 

 ner we have taken very fine fpecimens from SalcoT)ih bay. 

 At Falmouth in Cornwall a fliell very fimilar to this in 

 fhape is common on the fliore, and in the fand dredged 

 from the harbour: thefe have neither fpines nor tubercles, 

 vaftly flronger and thicker, the ribs more convex, on 

 which fometimes are a few rudiments of tubercles; colour 

 dark rufly -brown: infide furrowed only about half an inch 

 from the margin. 



We dare not venture to give this as a difiinft fpecies, 

 never having been able to procure it in a recent flate, al- 

 though we have picked up fome hundreds ; and what is 

 remarkable, none of the thinner fhells are to be met with 

 at that place. It is however fometimes found on fome 

 parts of the Dcvonjliire coaft with the other, and we have 

 taken it on the coaft of Caermarthen. 



The young of the echinatum have the ridges, or ribs fo 

 much more angulated or fharp, as to have been confound- 

 ed with the ciliarc 



Cardium cillare. Lin. Syft. p.ll22.S0.—GmeI. Syfl. p.324S.9. Ciliare, 

 Br. Zool t. 50. f. Z'i. , 



Cardium 



