286 TRIBE PECTINIDES. 
P. Niveus*. Macgy. Edin. Phil. J. 18, p. 166. t. 8. f. li =Fl, 
p. 384.—Brown, Brit. Conc. t. 22.f. 16.—Sow. Th. f. 223,4. Oval, 
rather thin, ventricose, upper valve slightly the larger ; ears unequal, 
the posterior rather large ; white (sometimes with angular red va- 
riegations ?) with forty smooth square ribs armed with distant acute 
and erect spines, the interstices flat. 1,/5....14...@. Britain. 
P. Psrvpormma. Sow. Th. f. 235. Rounded oval, rather 
oblique, subequivalve, ventricose, ears unequal, with scaly sulci, 
the posterior elongated acute and in the lower valve spinous at the 
margin, the anterior small and obtuse; ribs twenty-seven, thickish, 
bisuleated, somewhat rounded and armed with three rows of acute 
scales, the interstices narrow and flat: orange, variegated with white 
principally at the umbones. 14....1,%,.  Phalippines'. 

1 The following species of Lamarck I am unable to recognize. 
I give as usual a translation of their specific characters. 
P. Lingoraris. Lam. 12.—Del. t. 15, f. 3.—Chenu. Ill. Conch. 
Pecten, t. 15, f. 1. Both valves convex, whitish with extremely 
close-set concentric red lines on the upper valve: rays 17, smooth. 
1. Swollen near the beaks : ears equal. 
P. Frasetnarus. Lam. 36. Rounded, with fan-like folds, 
white, internally red : concentric striz in the interstices of the 15 
convex ray. 3. Resembling Opercularis; upper valve the less 
conver. (Hars unequal.) 
P. Dispar. Lam. 40.—Del. t. 15, f.2. Suborbicular, whitish ; 
upper valve smoothish, a large fivelobed stelliform chesnut spot 
at its base; numerous small rays towards the margin. 12. Pecu- 
liar from having the valves differing both in rays and colouring. The 
lower is white nith 18 equal rays ; the upper is white (reddish brown 
mithin) with a large star-shaped spot mith unequal pointed lobes. 
(Ears unequal.) 
P. Quaprirapiatus. Lam. 41. Ovate wedge-shaped, above 
with longitudinal strize, whitish staimed with blackish blue, with 
4 large rays; margins flexuous. %. Brought over by Peron, and 
is allied to Pes-lutre, but possesses two small rounded almost equal 
auricles. 
P. Hexactrs. Lam. 59. White, fanshaped, with 6 longitudi- 
nally striated rays, the central one the broader. 12. New Holland. 
See also P. Inpicus. Desh. (Zool. Belanger Voy.)—Saquamatus 
Menke (Synop)—Seuamutosus. Desh. (Exped. Morea.) —Zrant- 
cus Gray (Dieffen. N. Zeal.)—Jamrsont. Forbes (Wern. Mem. 8.) 
—Convexus and Fortacrus. Quoy. (Voy. Astrolabe.)—Tusrm. 
Bivon. (Phil. Moll. Sic.)—Dumasur. Payr. (Cat. Cors.)— 
Lavis. Pen. (Br. Zool.)—Lamaxrcku Micans and DELEssERTII. 
