TESTACEOUS MOLLUSCA. '283 



— E.t. 214,/. 5.-— Am. Mar. 5, t. 2,f. 3.— List. t. 175. Smaller 

 figures. — Ostrea Pellucens. W. t. 10,/. 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. ..7F. Indies. 



P. Albolineatus. 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. Sanguinolentus. Sow. Th. f. 59. — Ostrea S. Gmel. 

 3322.— D. p. 2o3.—Ch. /. 608.— W. t. 10,/. 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 sulcated ; hinge obliquely plicated. If. ..If. Red Sea, not 

 unlike Pallium. 



P. Pallium. Lam. 28.— Sow. Th. f. 148, 167.— Reeve, t. 114, 

 /. 4.— Ostrea, P. Lin. 1145,— D. p. 253.— W. 1. 10,/. 15.— Ch.f. 

 607.— List. t. 187,/ 25.— E.t. 210,/. 1.— Knorr. 2. t. 21. /. 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 striae ; white, 

 with bands of purple spots : inside white, the margins toothed and 

 orange. Variety. Orange with white spots. 3%...3h. South 

 Seas. 



P. Spiniferus. Sow. Z. P 1835.— Sow. Th. /. 229, 230 



P. Pulcherrimus. Gray in Beechey Zool. Subovate, rather 

 depressed, subequivalve, equilateral; ears unequal : the nine 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. Tranquebaricus. Lam. 25. — Sow. Th. f.\2 f l3. — Ostrea, T. 

 Gmel. 3328.— Ch.f. 647.— /F. t. 10,/. 45.— E. t. 212, /. 4.— 



