MYTILUS. 309 



Inhabits the Northern Ocean. Linnaus. 



Shell commonly about three-quarters of an inch long, and but 

 little more than one third as broad, somewhat moon-shaped, 

 nearly diaphanous, and of a greyish brown colour, with fine 

 longitudinal slightly crenated striae. 



Niger. 21. Shell compressed, brittle, very finely 

 striated, and the inner margin denticulated. 



Mytilus niger. Gmelin, p. 3362. 



Mytilus, No. 53. Schroeter Einl. iii. p. 469. 



Le Dotel. Adanson Senegal, p. 211. t. 15. f. 3. 



Inhabits the Western Coasts of Africa, frequent. Adanson. 



Shell an inch and a half long, and half as broad, with about 

 one hundred minute longitudinal striae, and covered with a 

 black epidermis, beneath which it is milk white and po- 

 lished ; the hinge has one or two minute teeth. Born has 

 quoted Le Dotel for M. bidens, but it appears by Adan- 

 son's description to be perfectly distinct, and more nearly 

 allied to M. striatulus. 



edulis. 22. Shell oblong, convex, smooth, flattish 

 on the posterior, and somewhat angulated 

 and keeled on the anterior side ; hinge ter- 

 minal and pointed. 



Mytilus edulis. Linnaus Syst. Nat. p. 1157. Pennant 

 Zool. iv. p. 1 10. t. 63. f. 13. Born Mm. p. 126. Chem- 

 nitz, viii. p. 169- 1. 84. f. 750 and 751, and xi. p. 254. t. 

 205. f. 2024. Schroeter Einl. iii. p. 434. Gmelin, p. 

 3353. Montagu Test. p. 159- Donovan, iv. t. 128. 

 f. 1. Maton and Racket, in Lin. Trans, viii. p. 105. 

 Lamarck Syst. des Anim. p. 1 13. Dorset Cat. p. 39- 

 t. 12. f. 5. 



Mytilus vulgaris. Da Costa Brit. Conch, p. 210. t. 12. 

 f. 5. 



Bonanni Rec. 2. f. 30, and Kirch, f. 29. Lister Anim, 

 Ang. t. 4. f. 28, and Conch, t. 362. f. 200. Argenville 

 Zoom. t. 5. f. D. Knorr, i. t. 4. f. 5 and 6, and iv. 1. 15. 

 f. 1. Regenfuss, i. t. 7. f. 8, and t. 11. f. 58. Favanne, 

 t. 50. f. O 1 and O 2. 

 Variety. Distorted, and much incurved on the posterior side. 



Mytilus incuryatus. Pennant, iv. p. 111. t. 64. f. 74. 

 Montagu Test. p. 160. Maton and Racket, in Lin. 

 Trans, viii. p. 106. t. 3. f. 7. 



