OSTREA. 
129 
the upper-valve a little convex, with a whitish depression 
near the hinge, the ribs strongly striate, which gives them 
a some nil at angular appearance, of a deep rufous brown 
color; the lower valve white, very convex, with the ribs 
much rounded and the grooves between them very deep, 
and nearly smooth or with only a few longitudinal lines 
on the lateral ribs; in which last circumstance it is distin¬ 
guished from O. maxima: ears equal, striate in a decussate 
manner; inside white, rufous round the margin: length 
three or four inches ; breadth four or five. 
Western coasts, and Dublin bay. v. v. 
* 3. Ostrea opercularis. Painted Scallop. 
Lister , pi. 182. f. 19, pi. 190. f. 27, pi. 191. f. 28, and 
192. f. 29— Pennant , pi. 63. f. 2— Da Costa , pi. 9. f. 1, 
2,4,5 —Linn. Trans, vi. pi. IS. f. 7, 8 — Dorset Cat. pi. 9. 
f. 1,2,4, 5. 
Pecten subrufus. Donovan , pi. 12. 
Shell nearly orbicular, with about twenty rounded ribs, 
striate both longitudinally and transversely, giving the sur¬ 
face a roughened or slightly beaded appearance; one of 
the valves much more convex than the other: color and 
markings in endless varieties of white, yellow, brown, red, 
or purple, sometimes plain, but mostly marbled or spotted, 
and which are much more richly displayed on the deeper 
valve ; inside white, polished, frequently tinged with other 
colors, with a tooth-like projection each side in each valve 
just below the ears : ears nearly equal, ribbed transversely 
and striate longitudinally : diameter two inches and a half. 
Varicbj. White, with a red longitudinal line down the 
centre of the ribs, on the convex valve. F'g. 74. 
Lister, pi. 170. f. 7- 
Ostrea lineata. Da Costa , pi. 10. f. 8 — Donovan, pi. 116. 
—Dorset Cat. pi. 10. f. 8. 
It will be clear to any one who closely examines 
this variety, that the supposed subcarinated appearance 
of the ribs, is merely caused by the red line down the mid¬ 
dle of each. In all other respects it is precisely similar to 
the 0. opercuiaris. The ribs in both are rounded at the 
bottom of the shell, and put on a gradually more sharpened 
edge as they approach to the hinge ; and we have observed 
