Hinges of BniiJJj Bivalve Shells. 



i6^ 



fervenfn, Linn, Syjl, Nat. ed. GmeL I. p, 3235. LiJI, Conch, t. 394. 



7:241, 



Tab. XV. Fig. 20, 21. 



■ This hinge, in one valve, has a finglc upright tooth, 



fituated by the fide of a flight deprcfiion, which is 

 divided in the micJdle by a fmall ridge. Tlie lower 

 valve has likewife an ere6t tooth, which is notched. 

 The fhape of this fliell approaches fo nearly to the 

 T, radiata^ that 1 imagine the hinge in both will 

 be found the fame. At prefent I have not an op- 

 portunity of comparing them. 



CARDIUiM. 

 acute aium, Linn. Syjl. Nat, ed. Gmeh l. /. 3247. Penn. Br, ZooL 

 No. 37. /. 50. y. 27- L)a Coji. Elem. of Conch, t. \. 

 f, 8. LiJl. Conch. 1. 321./. 128. Gault.Tef,t. 73. 

 /. A. Chemn. Conch. 6. /. 15-/. 155 — 157. 



Tab. XVI. Fig. i, 2. 



The chara6ler of the hinge in this fhell is fo flrongly 

 ' ' ^ ' marked, and fo exaclly refembles the other fpecies, 



that one figure will fuffice for the whole genus. 

 No other defcription is neceflary than what may be 

 found in the explanation of the plates. 



MACTRA. 



lutraria. Linn. Syji. Nat, ed, Gmel, i. p. 3259. Penn. Br. Zool, 



No, 44, t. 52. yi 44. LiJl. Conch, i. 415. f, 259. — 



' ■ " ' • An. Jng. t. 4,/. 19. Rumph, Muf, t.^S-f' ^' Chemn. 



Conch. 6. t. 24. /. 240, 241. 



—y:-::: :t " y 2 Tab, 



