312 MYTILUS. 



blackish brown epidermis, and the inside is pearly; young 

 shells have the epidermis green, especially towards the mar- 

 gin. M. saxatilis is badly constituted from Rumphius, t. 46. 

 f. J), which probably belongs to this species, and Gmelin 

 has quoted Chemnitz, rig. 748, both for Mytilus •versicolor 

 and for Mya Perna. 



perna. 26. Shell oblong, smooth, with the sides 

 nearly straight, and the apices acute ; hinge 

 with a tooth in each valve, and channelled. 



Mytilus Perna. Solander's MSS. Callones Cat. p. 42. 



No. 784. 

 Mytilus elongatus. Chemnitz, viii. p. 157. t. 83. f. 738. 

 Mytilus testaceus. Gmelin, p. 336 1. 

 Mytilus, No. 46. Schroeter Einl. iii. p. 465. 

 Mya Perna. Linnaeus Syst. Nat. p. 1113. Schroeter 



Einl. iii. p. 608. t. 7. f- 4. Gmelin, p. 3219- 

 Argenville, t. 22. f. N. Knorr, iv. 1. 15. f. 4. 

 Inhabits the Straights of Magellan. Linnceus. 

 Shell about five inches long, and two broad ; beautifully po- 

 lished and variegated with purple, violet, and blue ; Linnaeus 

 has expressed a doubt whether this species should not be re- 

 moved from the Myae to the Mytili, and Kaemmerer consi- 

 dered it to be only a variety of Mytilus edulis. 



smaragdinus. 27. Shell sub-triangular and com- 

 pressed ; hinge with two teeth in one valve 

 and one in the other. 



Mytilus smaragdinus. Chemnitz, viii. p. 166. t. 83. f. 745. 



Gmelin, p. 3359. 

 Mytilus, No. 11. Schroeter Einl. iii. p. 454. 



Variety. With the shell broader, and more compressed. 

 Mytilus, No. 12. Schroeter Einl. iii. p. 455. 

 Chemnitz, viii. t. 83. f. 746. 



Inhabits the coasts of Tranquebar, and the variety came from 

 Guinea. Chemnitz. 



Chemnitz has described this shell to be two inches long, and 

 eleven lines broad, and he says that the variety differs princi- 

 pally in being broader and flatter; the colour is reddish brown 

 coated with a green epidermis, and the inside is somewhat 

 pearly. 



confusus. 28. Shell three-sided, dilating from the 



