MYTILUS. 3i5 



tagu Test. p. 161. Dorset Cat. p. 40. t. 12. right hand 

 fig. 5. 

 Mytilus curtus. Pennant Zool. iv. p. 112. t. 76. f. 76, A. 

 Mytilus Modiolus. Brooks's Introd. p. 86. t. 4. f. 48. 

 Modiola Gibsii. Leach Nat. Misc. ii. p. 34. t. 72. f. 2. ? 

 Gualter, t. 91. middle fig. H. Enc. Meth. t. 218. f. 6. 



Inhabits the Mediterranean and coasts of Norway. Linmeus. 

 Jamaica. Lister. Great Britain. Pennant, fyc. Senegal. 

 Adanson. Denmark. Muller. Iceland and Greenland. 

 Chemnitz. Naples. Ulysses. 



Shell about four, or sometimes six inches long ; rather strong, 

 and covered with a purplish black epidermis ; the posterior 

 angle is more or less rounded, and the anterior side more or 

 less distinctly incurved ; from which variations, principally, 

 Dr. Leach has constituted three species, but they appear to me 

 to approach each other by so many intermediate gradations, 

 that it is impossible to draw any separating line. Young shells 

 are yellowish with brown rays, and often have the upper gib- 

 bous part of the posterior side of a dark chestnut colour ; they 

 also have the epidermis hairy towards the margin, and when 

 decorticated are bluish white with reddish brown rays. My- 

 tilus striatus of Montagu, aud other English authors, is pro- 

 bably the fry of this species. 



cygneus. 33. Shell transversely ovate, convex, 

 very brittle, and rather compressed on the 

 anterior side ; hinge lateral. 



Mytilus Cygneus. Linn&us Syst. Nat. p. 1158. Muller 

 Perm. ii. p. 208. Schroeter Fluss. p. 162. t. 3. f. 1. 

 Pennant Zool. iv. p. 113. t. 67. f. 78. Da Costa Brit. 

 Conch, p. 214. Chemnitz, viii. p. 185. t. 86. f. 762. 

 Schroeter Einl. iii. p. 440. Gmelin, p. 3355. Dono- 

 van, ii. t. 55. Montagu Test. p. 170. Maton and Rac- 

 ket, in Lin. Trans, viii. p. 109. t. 3 A. f. 2. Dorset 

 Cat. p. 40. 

 ,A.nodonta. Enc. Meth. t. 201. f. I. 

 La Grande Moule. Geoffroy, p. 139. No. 1. t. 3. 

 Lister Anim. Ang* App. t. 1. f. 3, and Conch, t. 156. f. 11. 

 Gualter, t. 7. f. F. Argenville, t. 31. left hand fig. 

 10. 

 Variety. Shell oval, with the posterior end radiated. 

 Mytilus radiatus. Muller Verm. ii. p. 209. Schroeter 

 Fluss. p. 16'2. 

 Inhabits Europe in ponds and rivers, not uncommon. 

 Shell about two inches and a half long, and six inches broad ; 



