278 TRIBE PECTINIDES. 
on each side much narrower and serrated across: lower valve 
with but twelve ribs, the lateral alone serrated. 14..1. Ceylon and 
Singapore. 
P. Raputa. Lam. 13.—Sow. Th. f. 154,5.—E. t. 208. fi 2.— 
Ostrea R. Lin. 1145.—W. t. 10. f. 11.—D. p. 251.— List. t. 175. 
fi. 12.—Ch. f. 599,0.—Knorr. 5. t. 9. f. 4. Subtriangular, thick, 
compressed, scabrous, with radiating sulci,, anteriorly subelongated 
at the margin, the sides flattened ; ears nearly equal, obtuse, roughly 
ribbed, emarginated at the base ; pale yellowish spotted with brown 
or black, sometimes nearly covered with brown bands, with from 
nine to twelve elevated squarish ribs, which are thick, radiately 
grooved and concentrically striated, the interstices broad and sul- 
cated; hinge obliquely plicated. 34...32. Ceylon. 
P. Vetutinus. Sow. Th. f. 31. Suboval, rather compressed, 
equilateral, with fine radiating strie, rather swelled at the mar- 
gin; the ears nearly equal, striated; hinge obliquely plicated ; 
reddish fawn coloured, with variegated angular bands of white 
margined with brown, with five thick and rounded ribs which 
gradually become fainter, 1}...33.  Macassar. 
P. Noputirervus. Sow. Th. 7. 38, 39, 94. Subtriangular, 
rather compressed, with radiating striz, equivalve; ears radiately 
sulcated, the posterior slightly the larger; hinge obligely plicated ; 
red with angular spots, (clouded inside) and eight thick rounded 
and nodulous ribs which are internally plicated at the margin. 
1,46..1,35 Not unlike Corallinoides. 
P. Suspricatus. Sow. Th. f. 37, 72, 73, 81. Equivalve, sub- 
triangular, subequilateral, depressed, with radiating strie; ears 
large, striated, the anterior the larger and nearly rectangular ; 
hinge obliquely plicated; light cream coloured, with angular 
patches of dark blackish brown or brick red, with five broad 
scarcely elevated ribs, the interstices very broad; inside brown 
particularly about the hinge. 13..1,%. Amboyna. 
P. Prica. Lam. 19.—Sow. Th. f. 237,8,9.—Ostrea P. Lin. 
1145.—D. p. 252.—Ch. f. 598 & 2041.—W. t. 10. f. 18. 
Rounded-trigonal, ventricese, thick, with radiating strie, flattened 
near the umbones; ears small, nearly equal, obtuse, striated, con- 
tracted at the sides ; variable in colouring, usually with large patches 
of a dark colour on a light ground, the three central ribs thick 
and rounded, the two on each side of them. much smaller; in- 
ternally with tooth-like plaits, the hinge brown and plicated. 
18,..12. Nicobar, Ceylon, China. 
P. Corattrnowes. D. Orb. Mol. Can. p. 102.—Sow. Th. f. 3, 4 
Rounded, ventricose, equivalve, with radiating striz, anteriorly 
produced, red, clouded, the ribs alternately paler; ears sulcated, 
obtuse, the posterior the larger, emarginated at the base, hinge 
