1” 
transverse and straight; the beaks contiguous ; 
hinge toothless, the cardinal cavity entirely internal, 
triangular, and receiving the ligament. 
* Hars equal or nearly so. 
P. Maximus. Pen. 4. p. 219. ¢ 62.—Lam. 1.— 
 F. p. 383.—Turt. B. p. 207.—Ch. f. 585.—Mont. p. 
143.—OstrEA M. Lin. 1144.—Zast. ¢. 163. fi 1.— 
Knorr. 2. t. 14. f. 1.—E. ¢. 285. f. 1.—Don. 2. t. 
49.—Lin. T. 8. p. 96.—Dor. Cat. p. 37. t. 9. f. 3.— 
D. p. 247.—Turt. D. p. 128.—P. Vuuearis. Da. 
Cos. t. 9. f. 3.—Suborbicular, inequivalve, one valve 
being convex white and tinged with yellow towards the 
beaks, the other flattish concave towards the beaks and 
usually brownish red, or white variegated with pink or 
brown ; about fourteen radiating rounded ribs. 4 or 5. 
The common scallop. 
P. Opercuaris. Pen. 4. p. 221. t. 63. f, 2.— 
Mont. p. 145.—Lam. 34,—F. p. 383.—Turt. B. p. 
209.—#. #. 112. f. 2.—Ostrea O. Lin. 1146.—Dor. 
Cat. p. 38. t. 9. f. 1,2,4,5.—D. p. 266.—Turt. D. p. 
129.—(P. Pictus. Da. Cost. t. 9. f. 1,2,4,5.)—List. 
t. 190. f. 27.—Knorr. 2. t. 2. f. 2,3.—Suborbicular, 
the upper valve the more convex, with from eighteen to 
