TRIBE PECTINIDES. 293 
with elongated tapering subspathulate lamine that are generally 
more or less curved: interstices devoid of sculpture. Var. The 
ribs alternately larger and smaller. Var. Ground-colour blackish 
purple, lamin orange and reddish purple. 33. Mauritius. There 
are no indications of larger cost@ at the beaks. 
S. Marts-rupnri, Bolten, for 8. AcuLzatus, de. Ch. 7, p. 74, f. 460, 
468.—S. A. Sow. Th. 1, p. 419, t. 85, f. 11, 18.—S. Denratus, Chenu, 
Il. C. Spon t. 25, f.1. Ribs very numerous, rather broad, of nearly 
equal size, armed with crowded more or less flattened white or yellow 
spinous lamine; interstices usually of a purplish red, rendered sca- 
brous by crowded radiating lines of squamular spines. 4. Mauritius. 
S. Nupus. Ch. 11, p. 235, f. 1989, 0.—Reeve, C. S. t. 119, f. 10. 
—Chenu, Il. C. Spon. t. 24, f. 6.—Sow. Th. 1, p. 480, t. 88, f. 39, 
40.—S. Anacantuus, Mawe, t. 11, f. 3. Small, devoid of ribs, cos- 
tellze or lamin ; colour scarlet and white, arranged in lines, so that 
either some of the subgranular raised striz which closely cover the 
surface are white upon a brilliantly red ground, or are intensely red 
upon a partially white ground. Var. <A few of the striz with small 
obsolete scaly tubercles. 14. Red Sea; Philippines. 
S. Varians. Sow. Ap. Stutch—Sow. Th. 1, p. 426, t. 86, f. 21, 2. 
—S. DELEssEeRTIANUS and 8. Osxiquus, Chenu, Il. C. Spon. t. 12, 
and t. 24, f. 5. Ponderous, very large, oval, white, red at the um- 
bones, profusely covered with rather flattened and depressed elongated 
spatulee ; hinge-area usually produced, and banded with brown; 
lower valve generally attached by nearly its whole surface, inside 
often with water enclosed between the lamelle in aged examples. 
Young. Smooth, triangular, orange or purple, with 5 or 6 beaded 
ribs, and a very elongated hinge-area. 12. South Seas. 
S. Leucocantoa. Brod. Z. P. 1833.—Sow. Th. 1, p. 423, t. 87, 
f. 35, 6. Of a whitish or pinkish flesh-colour, at most only obsoletely 
ribbed, radiated with extremely numerous rows of strong curved 
flattened and rather produced scales, which are white at their sub- 
truncated apices, and pink at their commencement; the larger of 
them are broad-based in the more characteristic examples. Var. Of 
an uniform purplish red, except at the beaks, which are devoid of 
colour. 4. W. Columbia. There are generally 6 principal ribs, 
between each of which stand 3 rows of scales, some of which are pointed 
at the ends. 
S. Princers. Brod. Z. P. 1833.—-Reeve, C. S. t. 116, f. 2.— 
S. Picrorum, Sow. (as of Ch.) Th. 1, p. 422, t. 88, f. 45. Of an 
uniform colour that ranges from reddish to purplish crimson; rayed 
with numerous depressed ribs, none peculiarly prominent, but mostly 
well defined and alternately larger and smaller. Ribs armed with 
moderately close-set elongated spathuliferous lamin, which, in typical 
