« 



Hinges of Britijh Bivalve Shells. ijl 



Tab. XVIII. Fig. 7, 8. 

 Hinge toothlefs, being only a trigonal cavity in 

 the very centre of the commifTure or fummit of the 

 fhell, wliich runs in a ftraight horizontal line." Da 

 Cojl, Br. Conch, p. 140. 



OSTREA. 

 tdulis. Linn. Syjl. Nat. ed. GmeL I. /. 3334. Liji. Conch, t. 194. 



/•SI- 

 TAE. XVIII. Fig. 9, 10. 

 The (hells of this genus are conneded together by a 

 ftrong central cartilage. There is a variety with a 

 rugofe appearance on each fide of the hinge, which 

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



ANOMIA. 



Epbippium. Linn. SyJl. Nat. ed. GmeL i. p. 3240. Penn. Br. ZooL 

 No. 70. /. 62./ 70. DaCoJl.Br. Conch, p. 165. 1. 11. 

 f. 3. Lijl. Conch, t. 204.7^ 38. 



Tab. XVIII. Fig. 11, 12. 

 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 my fpecimen. 



MYTILUS. 



edulis. Linn. S)J{. Nat. ed. GmeL I. /. 2,Zi)0' P^""- ^''- ^'""'• 



No. 73. t. 6^.f. 73. Da CoJl.Br. Conch, p. 216. /. i j. 

 , f. ^.left hand. 



Z 2 Tab. 



