TESTACEOUS MOLLUSCA. 283 
—E.t. 214, f. 5.—Am. Mar. 5, t. 2, f. 3.—List. #. 175. Smaller 
Jigures—OstreEA Pettucens. W.t. 10,f. 24. Oval subtriangular, 
compressed, equivalve, scabrous ; ears unequal, the anterior minute, 
the posterior large, acute, and sulcated; upper valve with nume- 
rous unequal alternately more prominent ribs ; those of the lower 
valve in pairs; interstices scabrous: nearly white, variegated with 
undulating banded patches of deep red generally interrupted by 
three of the ribs being white. Var. Nearly uniform dark red, 
1,10...0,93...W. Indies. 
P. AtpotinEatus. Sow. Jun. Z. P. 1842.—Sow. Th. f. 69. 
Oval-subtriangular, compressed, equivalve; ears unequal, the 
anterior minute, the posterior large acute and sulcated ; ribs very 
numerous equal and rather square, the interstices smooth: nearly 
white with grey spots on the under valve, and in the upper valve 
the tops of all the ribs excepting three grey, the spaces between 
the white ribs being crossed by narrow lines of white. 1,15...0,93. 
Philippines. 
P. Saneurinorentus. Sow. Th. f. 59.—Ostrea S. Gmel. 
3322.—D. p. 253.—Ch. f. 608.—W. t. 10, f. 16. Oval subtri- 
angular, scabrous, subequivalve, subequilateral ; ears unequal, 
acute, with nodulose sulci, the anterior the smaller: white tinged 
with rose-colour, variegated with distant broad red bands on the 
nine thick much raised and squarish ribs, which have nodulous 
sulci and are serrated on their sides, the interstices large and nodu- 
lously suleated ;_ hinge obliquely plicated. 1%...12. Red Sea, not 
unlike Pallium. 
P. Patuium. Lam. 28.—Sow. Th. f. 148, 167.—Reeve, t. 114, 
f.4.—Osrrea, P. Lin. 1145,—D, p. 253.—W. t.10, f. 15.— Ch. f. 
607.—Iast. t. 187, f. 25.—E. t. 210, f. 1. —Knorr. 2. t. 21. f. 1, 2. 
Suborbicular, compressed equivalve, subequilateral ; the ears un- 
equal, with nodulous sulci; ribs fourteen to sixteen, elevated, thick 
squarish, divided into three, armed with three rows of thin sharp 
scales on each rib, the interstices rough with scaly striz ; white, 
with bands of purple spots: inside white, the margins toothed and 
orange. Variety. Orange with white spots. 32...33. South 
Seas. 
P. Spintrerus. Sow. Z. P 1835.—Sow. Th. f. 229, 230.— 
P. PuncwEeRnrimus. Gray in Beechey Zool. Subovate, rather 
depressed, subequivalve, equilateral; ears unequal: thenine broad 
ribs armed with fimbriated scales: the anterior posterior and 
dorsal edges spinulose in one of the valves. 0,25...0,9. Lord 
Hood's Island. 
P. Tranauesaricus. Lam, 25.—Sow, Th, f.12,18.—Osrrea, T. 
Gmel. 3328.—Ch. f. 647.—M. t. 10, f. 45.—E. t, 212, f. 4.— 
