109 



GFNUS. MYTILUS. 



Longitudinal, equivalve, acute at the base, usually 

 affixed by a byssus ; beaks acute, somewhat straight 

 and terminal ; hinge lateral and usually toothless, 

 ligament marginal and subinternal; scar elongated, 

 clavate, sublateral. 



M. EDULIS. Lin. 1157. Ch.f. 750. Pen. 4. p. 

 236. t. 66./. 2. Don. 4. t. l2S.Mont. p. 159. 

 Lin. T. 6. t. 18./. 13,4. Dor. Cat. t. 12./. 5.1. hand. 

 D. p. 309.Turt. D. p. 109. Da. Cost. t. 15. /. 

 5. 1. hand.E. t. 218. /. 2.Knorr. 4. t. 15. / 1. 

 F. p. 411. Oval -oblong, smooth, posteriorly tumid 

 towards the beaks, curved and somewhat carinate ante- 

 riorly, rich blue under the epidennis; beaks blunt; 

 hinge with four or five teeth. 2. Common Muscle. 



* An var. M. SUBSAXATILIS. Williams in Mag. 

 Nat. 7.^.354. An. M. GALLOPROVINCIALIS/* Lam. 

 Strong, solid, the hinge line longer and very straight, 

 thus forming a more or less distant angle with the ven- 

 tral edge. I believe it to be a distinct species. 



* When beween rocks the posterior edge becomes 

 concave. 



