151 



GEN. XV. 



OSTREA. 



Afiimal a TETRYS. 



SHELL, bivalve, inequivalve, rugged or plated; no 

 auricles. 



Hinge toothlefs, with a tranfverre, flriated cavity. 



1. 

 Oilrea edulis. Lin. Syji. p. 1148.— G/;W. Syji. p. 3334. 105. Edulis. 



C/ieiii. Co/ic/i. viii. t. 74. f. 6S2. 



Gualt. t. 102. A. B.—Br. Zool. No. 69. • 



Lifter Conch, t. 193. f. 30.— t. 194. f. 31. 



Id. Angl. t. 4 f. 2b.—?ult. Cat. Dorfet. p. 36. 



Turt. Lin. iv. p. 21A.—Favan. t. 80. C. 



Lin. Trans. v\. t. 18. f. 9. 10. (l^'ood,) 

 Oilreum vulgare Da Cojia. p. 154. t. 11. f. 6. 



O with a fub-orbicular, rugged fliell, with plates or 

 folds lying over each other ; generally of a brown colour. 



This fpecies, fo well known, requires little defcription : 

 it varies greatly in fliape and fize, according to the fitua- 



tion 



