310 MYTILUS. 



Inhabits the European, Baltic, and [ndian Seas. Linnceus, fyc. 

 and is the most common of all British shells. 



Shell two or three inches long, and half as broad, of a blackish 

 blue colour, sometimes radiated with tine blue, and covered 

 with a brown epidermis ; the inside is blue towards the edge, 

 and whitish in the middle ; on the margin under the umbones 

 are several tooth-like crenulations. 



pellucidus. 23. Shell oblong, convex, very smooth, 

 rather convex on the posterior, and somewhat 

 angulated and keeled on the anterior side; 

 hinge terminal and pointed. 



Mytilus pellucidus. Pennant, iv. p. 1 10. t. 63. f. 75. Do- 

 novan, iii. t. 81. Montagu Test. p. 160. Maton and 

 Racket, in Lin. Trans, viii. p. 107. 

 Mytilus edulis, Var. Solander's MSS. Chemnitz, viii. p. 



174.1.84. f. 755. 

 Regenfuss, i. t. 12. f. 71. 

 Inhabits the coasts of Britain. Pennant, fyc. 

 Shell about two inches Jong and half as broad, of a bluish 

 white colour, more or less radiated with dark blue or purple, 

 and covered with a yellow epidermis ; in shape it much re- 

 sembles M. edulis, of which it is probably nothing more 

 than a Variety, and differs principally in being more convex 

 on the posterior side, and more smooth and glossy. 



ungulatus. 24. Shell oblong, with the posterior 

 side incurved, and the summits conical and 

 diverging; hinge with two or three minute 

 teeth. 



Mytilus ungulatus. Linnaus SysL Nat. p. 1157- Born 

 Mus. p. 127. Chemnitz, viii. p. 176. t. 84. f. 756. 

 Schroeter Einl. iii. p. 436. Gmelin, p. 3354. Dono- 

 van, iv. 1. 128. f. 2. Maton and Racket, in Lin. Trans. 

 viii. p. 107. 



Mytilus ungulinus. Montagu Test. p. 582. 



Lister Conch, t. 360. f. 199. Gualter., t. 01. f. E. Regen- 

 fuss, i. t. 4. f. 47. 

 Junior. Mytilus viridis. Linn&us Syst. Nat. p. 1158. 

 Gmelin, p. 3356. 



Mytilus pictus. Born Mus. p. 127. t. 7. f. 6 and 7- 



Mytilus Africanus. Chemnitz, viii. p. 160. t. 83. f. 739 to 

 741. 



Mytilus Afer. ' Gmelin, p. 3358. 



