Hinges of Britljh Bivalve Shells » V)\ 



Tab. XVIII. Fig. 7, 8. 

 " Hinge toothlefs, being only a trigonal cavity in 

 the very centre of the commifTurc or fummit of the 

 fliell, which runs in a ftraight horizontal line." Da 

 Cojl, Br. Conch, />. 140. 



OSTREA. 

 edulis, Linn» Syjl. Nat. ed. GmeL i./- 3334. Lijl* Conch, /. 194. 



Tab. XVIII. Fig. 9, 10. 



The fliells of this genus are conneded together by a 

 flrong central cartilage. There is a variety with a 

 rugofe appearance on each fide of the hinge, which 

 is very well reprefentcd in Dr. Lifter's figure. 



>..^v ANOMIA. 



Epbitpium. Linn. Sv/i. Nat. ed. GmeL I. p. 3240. Pemu Br. Zooh 

 No. 70. /. 62.ytyCjr~BiTCojf. Bt . Conch, p. 16^. t. 11. 

 f. 3. Lijl, Conch, t. 204./^ 38. 



Tab. XVIII. Fig. 11,12. 

 ; .:; -.:: io A fimple cartilaginous hinge with an oval cavity in 

 ^^^ the concave valve. Da Cofta mentions a claw in 



the other valve, which is not in iry fpecimen. 



^,^ ,^ MYTILUS. 



,A^. 



eduUs, Linn, Syjl, Nat. ed. GmeL I. p. 3353. Penn, Br. ZooL 



No. 73. /. 63./. 73. Da CoJl.Br. Conch, p. 216. /. 15. 

 y: 5. left band. ;:: ,^ 



:i ' Z 2 Tab. 



