165 



Mytilus i-ugofus. Dii Cofta. p. 223. 



Pah. Cat. Dorfct. p. 37. 

 Lifter Conch, t. 426. f. 267. 

 Id. And. t. 4. f. 21. 



o 



M. with an oblong, fub-oval (hell, with rugged, con- 

 centric wrinkles : colour dirty-white, covered with a yel- 

 lowifh epidermis: fide next to the hinge always rounded; 

 the oppofite fometimes truncated : umbo fmall, obtufe, 

 placednear toone end. Infide white. It rarely exceeds an 

 inch and a quarter in length; breadth about half its 

 length: is however very fubjeft to vary in ihape; foine 

 are very little longer than they are broad, others exceed 

 the breadth nearly three times, and fo convex as to be 

 almofl; cylindric. It mofl; ufually gapes at one end, and 

 fometimes in the front, oppofite the hinge. 



This fpecies is found on many of our coafls, burrowed 

 in lime-ftone, in great abundance: is not uncommon on 

 fome parts of the coad; of Devon, in company with the 

 Donax Iriis, particularly about Plymouth, and at Torbay. 



8. 

 M. with an oblong, irregular, rugofe fhell, wrinkled Pr^fxisus. 

 and frequently much dillorted : commonly fo much tlie Iab. 4. f. 2. 

 fhape of the Soien minutus, as to be eafily confounded for 

 a worn fhell of that fpecies, having loft the fpines ; others 

 refemble the Mytilus rugofus. The particular charatlers 

 are, thai the hinge is clofe to one end, which fide is quite 

 fquare as if cut oiF; the beak large, prominent, and pro- 



jcds 



