1(30 



with a brown epidermis; fometimes radiated with fine 

 blue. Infide blue about the margin, whitifh in the mid- 

 dle: beneath the beak are feveral teeth-like crenulaticns. 

 Length three inches ; breadth one and a half. 



This is the moll common of all BriiiJJi (hells, found in 

 vafl; beds fixed by the hyjfus. 



I.vcuRVATUS. Mytilus incurvatus. iSr. Zoo/, t. 64. f. 74. 



Lijier Co7ich t. 357. f. 195. 196. 

 Turt. Lin. iv. p. 292. 



This fliell is very like the laft, but broader in propor- 

 tion to its length : the pofterior fide much incurvated : 

 crenulations under the beak the fame. 



Whether this is really a diftinft fpecies may be doubted. 

 It is ufually found fixed into fome crevice of a rock fingly, 

 and not in beds like the cdulis. Many appear diftorted 

 about the beak, as if the flicll was prevented in its growth 

 by accident; and we think the intermediate gradations, 

 between this and the preceeding, bring them fo near to- 

 gether, as fcarce to allow a fpecific din:in61ion. It is how- 

 ever of a very inferior fize, ftldom exceeding an inch and 

 a half in length; and one inch broad. 



S. ^^ 



Pellucidus. Mytiluspellucidus. Br. Zool. t 63. f.75. — Turt. Lin. iv.p,292. 



Chem. Conch, viii. t. 84. f. 755. 



M. with a tliin, pellucid fhell, of a whitifh colour, or 



tinged 



