MYTILUS. 301 



frons. 3. Shell plaited towards the margin, and 

 transversely wrinkled, without any spines ; 

 one lip rough. 



Mytilus Frons. Linntzus Syst. Nat. p. 1155. Born Mus. 



p. 123, and Vign. at p. 121. f. b. Schroeter Einl. iii. p. 



424. Gmelin, p. 3350. 

 Ostrea Frons. Mus. Geversianum, p. 424. Solander's 



MSS. Portland Cat. p. 30. lot 713. Callones Cat. 



p. 53. No. 1007. Chemnitz, viii. p. 61. t. 75. f. 686. 

 Ostrea. Erie. Method, t. 186. f. 4 to 6. 

 Lister Conch, t. 197- f. 32, and t. 198. f. 32 a. Gualter, 



t. 104. f. C. Argenville, t. 19. f. D. Knorr, iv. t. 8. 



f. S. Favanne, t. 45. f. D 1 and D 2. 

 Inhabits the Indian Ocean on Gorgoniae. Linn&us. Coasts 

 of Jamaica. Lister. St. Croix. Chemnitz. St. Domingo, 

 Guadaloupe, Acapulco, and St. Christophers. Humphreys. 

 Shell one and a half, or two inches long, and generally about 

 equally broad, but varies in shape according to the substance 

 it adheres to ; the colour is most commonly reddish brown, 

 and the inside yellowish ; it is plaited towards the margin, 

 and there is an elevated rib in the middle of one valve, and a 

 corresponding depression in the other. 



** Flat, or compressed into a flattened form, and 

 slightly eared. 



margaritiferus. 4. Shell sub-orbicular, com- 

 pressed, covered with transverse membrana- 

 ceous scales, and the inside pearly. 



Mytilus margaritiferus. Linnccus Syst. Nat. p. 1155. Bom 

 Mus. p. 124, and Vign. at p. 121. f. a. Chemnitz, viii. p. 

 126. t. 80. f. 717. Schroeter Einl. iii. p. 426. Gmelin, 

 p. 3351. Barbut Verm. p. 6Q. 1. 11. f. 4. Shaw Nat. 

 Misc. xx. t. 831. 



Avicula. Enc. Meth. t. 177- f. 1 and 2. 



Bonanni Rec. and Kirch. 2. f. 1. Lister Conch, t. 221. 

 f. 56, t. 223. f. 57, and t. 224. f. 58. Rumphius, t. 47. 

 f. F. Petiver Amb. t. 20. f. 4. Gualter, t. 84. f. E, F 

 and G. Argenville, t. 20. f. A. Knorr, iv. t. 18. f. 1. 

 Da Costa Elements, t. 7. f. 14. Favanne, t. 41. f. E 4. 

 Variety B. Shell plaited longitudinally, and of a bright green 



colour. 



Chemnitz, viii. p. 132. t. 80. f. 718. 



