274 TRIBE PECTINIDES. 
internally striated, toothed at the margin, gaping on each side; 
ears equal and obtuse ; tawny, the margins purplish, with radiating 
and concentric red bands; lower valve much lighter. 1-9;.. 14. 
China. 
P. Prevronectes. Lam. 7.—Sow. Th. f. 127,128,135, 136. 
-——Bl. t. 60. f. 5.—Ostrea P. Lin. 1145.—D. p. 250.—W. t. 
10. f. 6.—Gualt. t. 73. f. BA— Knorr. 1. ¢. 20. f. 3, 4.—Ch. f. 
595.—E. t. 208. f. 8. Orbicular suboval, smooth, compressed, gap- 
ing on each side; ears equal, obtuse; internally, with twelve pairs 
of slightly raised linear ribs, the insterstices substriated ; upper 
valve pale greyish fawn, dark mahogany brown or purplish 
pink, lighter near the umbo and radiated with bands of a darker 
colour, each band defined by a sharp line on either side: lower 
valve white. 333;..35. China. 
P. Javonicus. Lam. 9.—Sow. Th. f. 109,0.—Ostrea J. Gmel. 
8817.—D. p. 250.—Ch. f. 596.—E. t. 208. fi 4.—W. t. 10. 
Jf. 7. Orbicular, smooth, rather compressed, gaping considerably 
on each side; ears equal, obtuse, smali; internally with twenty- 
two pair of ribs; upper valve dull red with concentric lines and 
bands of a darker tint, with faint light rays; right valve white. 
51..5. China and Japan, 
P. Laurenti. Lam. 6.—Sow. Th. f. 137,8.—Ostrea L. 
Gmel. 3317.—Ch. f. 593,4.—E. t. 208. f. 1.—W. #. 10. f.8.— 
O. Ziczac. Var. D. p. 249. Suborbicular, with a rounded angle 
at each side, smooth; the ears broad, rectangular, with undulated 
margins ; upper valve rather flat, elevated at the sides, reddish 
brown, faintly radiated with darker brown and speckled with 
white, about forty-seven internal ribs; lower valve radiated with 
pale brown on a pale fawn ground, ventricose, rather compressed 
at the sides, white at the umbones, with about forty-one internal 
ribs. 34..32. China. 
P. Macettanicus. Lam. 10.—Sow. Th. f. 122.—Am. Mar. Con. 
t.1, f. 1.—Osrrea M. Gmel. 3317.—D. p. 250.—Ch. f. 597.—E. 
t. 208. f. 5.—W. t. 10. f. 9. Orbicular, rather flat, gaping on each 
side, radiated with numerous rough minute striz; ears striated, 
broad, rectangular ; the brown upper valve more ventricose than the 
nearly white lower one. 3+4..3+4. Massachussets, 
P. Exorticus. Chem. f. 2037,8.—Desh. ed. Lam. 7. p. 154.— 
Ostrea E. D. p. 259.—W. ¢. 10. f. 28.—P. Psrupamusium. 
Sow, Th. f. 211, 2, § 243.—Pseudamusium Leave Klein. t. 9.f. 31. 
(a copy from List. t. 173.) Orbicular, compressed, smooth, or 
most minutely striated; ears flat, equal; ash or pale fawn with 
large brown spots. 15%...143,. Gambia, Africa. 
P, Grantanpicus. Sow, Zh. f. 40. Equivalve, orbicular, rather 
