196 CONCHYLI A— DITHYE^. 42. 



except in size, and in being furnished with rough transverse ridges. 



edulis. Mytilus testd ovato-oblongd leevi, anticS curvatd subcarinatd, umboni- 

 bus subquadridentatis. 

 Shell oval-oblong smooth, curved and somewhat carinate on the an- 

 terior side, with four or five teeth in the hinge. 

 Mytlus edulis. Linn. Syst. Nat. p. 1157. 



Gmelin, Syst. p. 3353. 



Turton, Linn. Syst. iv. p. 291. 



Chemnitz, viii. p. 169, tab. 84, fig. 750. 



Pennant, iv. p. 236, tab. 66, fig. 2. 



Donovan, iv. tab. 128, fig. I. 



Montagu, Test. Brit. p. 159. 



Linn. Trans, vi. tab. 18, fig. 13, 14. 



Linn. Trans, viii. p. 105. 



Turton, British Fauna, p. 163. 



Dorset Catal. tab. 12, fig. 5, left hand. 



Dillwyn, Descript. Catal. p. 309. 



Turton, Conch. Diet. p. 109. 

 Mytilus vulgaris. Da Costa, p. 216, tab. 15, fig. 5, left hand. 

 Musculus subcaeruleus. Lister, Conch, tab. 362, fig. 200. 

 Mus. nost. Common. 



A well-known species, subject to much variety of shape, gene- 

 rally of a rich blue when the outer coat is taken ofi", sometimes with 

 an indenture or fold near the beak, as in the variety of Modiola 

 Modiolus. 



