280 TRIBE PECTINIDES« 
with black bands and white spots (also a purple variety); with 
eight broad thick elevated and suleated ribs, the interstices broader 
and sulcated; ears unequal, with nodose sulcations, the anterior 
small, the posterior large. 24...2,9, Mediterranean, Sc. 
P.. Paryus. Somes Ze, ws 183 é. sa Slate DBs hs. 22tBie Sub-= 
ovate, rather depressed, subequivalve, equilateral, whitish; ears 
unequal and granulated ; white with eight unequal transversely 
striated radiating ribs, the interstices with radiating sulci and tran- 
verse strie. %...4 Lord Hood's Island. 
P. Imsricatus. Lam. 31.—Reeve. t. 114* f. 2.—Sow. Th. f. 
32,3.—Osrrea I. Gmel. 3318.—D. p. 252.—E. t. 214. fi. 2.— 
W.t. 10. f. 12. (Worn shell. O.Sauctara. Gmel.—Ch. t. 69, 
H.—W. t. 10. f. 32.) Subtriangulay, flat, nearly smooth, subequi- 
valve ; ears unequal, flat, knobbed at the margin, the anterior small 
and nodose, the posterior large and acute ; upper valve flat, with 
nine rounded subangulated ribs, which are armed with hollow 
imbricated tubercles, and alternately depressed: lower valve sub- 
ventricose, the ten ribs noduliferous and equal. White spotted 
with purple, the ribs alternately spotted with red ; inner disc yellow, 
the margin purple. 13...1,3, Red Sea. 
P, Rusromacunatus. Sow. Th. f. 34. Oval subtriangular, 
equivalve, subequilateral, somewhat compressed: ears unequal, 
with scabrous sulci, the anterior smal], the posterior large; ribs 
eighteen, scaly near the margin, alternately depressed and smaller, 
the interstices slightly striated ; ribs of the lower valve numerous, 
minutely squamular, unequal ; sulphur coloured, the more depressed 
ribs with deep red spots in the centre of the shell. 1...0,92. 
P, Ticris. Lam. 30.—Sow. Th. f. 95,6.—Ch. f. 608.—Phil. 
Conch. Pecten, t. 1, f. 6. Subequivalve, obliquely subtriangular, 
somewhat flat, rather scabrous, with strong internal ribs; ears un- 
equal, sulcated, the anterior small, the posterior acutely angulated ; 
yellowish white with tiger-like stripes of dark reddish brown, and 
eleven strongly grooved radiating ribs which are angulated above, 
(the lateral ones small) the interstices grooved ; within yellow, 
with a black band on the hinge and a pink spot at the base of the 
posterior auricle of the upper valve. 12...3. Phalippines. 
P. Maprerorarum. Petit.—Sow. Th. f. 68. Phil. Conch. Pecten, 
t. 2, f. 4,5. Obliquely ovate, compressed, irregular, with radiating 
striaz; ears unequal, the posterior large, the eae small ; white 
with black spots and seven obsolete distant ribs. 4..2 Red Sea. 
P. Te, ia, Sow. Ths f. 90:—Ostrea, Tae WS. 2.2: f Bi 
Subquadrate, irregular, subequivalve, compressed, foliaceous ; 
brown very slightly variegated ; ears unequal, the posterior very 

4 The P, Savcratus of Lam. is probably a variety of Ornatus. 
