Hinges of Britift) Bivalve Shells. 



163 



fervenfis. Linn. Syjl, Nut. ed. Gmcl. l. p. 3235. Lljl. Concb, t. 394. 



/24t. 



Tab. XV. Fig. 20, 21. 



This hinge, in one valve, has a fingle upright tooth, 

 fituated by the fide of a flight depreflion, which is 

 divided in the middle by a fmall ridge. The lower 

 valve has likewife an ere6l tooth, which is notched. 



The ftiape of this fliell approaches fo nearly to the 

 T. radiata, that I imagine the hinge in both will 

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

 portunity of comparing them. 



CARDIUM. 



acukatum. Linn. Syji. Nat. ed. Gmel. i. p. 3247. Penn. Br. Zool, 

 ^°- 37- *• S°' f- 2)7- ^^ ^°ft- Elem. of Conch, t. i. 

 / 8. Lijl. Conch, t. 32 1./ 128. Gault.Tef. t. 72. 

 f. A. Chemn. Conch. 6. /. 1$. f. 155 — 157. 



Tab. XVI. Fig. i, 2. 



The character of the hinge in this fliell is fo flrongly 

 marked, and fo exadlly 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. S}f. Nat. ed. Gmel. i. /. 3259. Penn. Br. Zool. 



No. 44. /. 52. / 44. Lif. Conch, t. 41^. f. 259.— 

 An. Jng. t. 4./. 19. Rumph. Muf. t. ^S-f M. Chemn. 

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



Y2 Tab. 



I 



