356 TESTACKOUS MOLLUSCA. 
p. 68. Ovate, very inequilateral, shining, pale yellowish white, sub- 
ventricose, not very solid, smooth or with irregular concentric 
wrinkles; ventral edge entire, subarcuated; front extremity bluntly 
rounded; hinder extremity attenuatedly rounded; ligamental edge 
not much sloping; beaks very acute, much inclined; lunule not im- 
pressed, defined by an incised stria; no dorsal area; ligament not 
prominent; inside wholly white. 14...13. ‘“ Jamaica.” 
CYTHEREA VARIANS (t. 15, f. 33), Hanl. Z. P. 1844, p. 109.—Sow. 
Th. 2, p. 639, t. 1388, f. 188, 9— Dione v. Desh. Vener. p. 66.— 
C. ruBiGINosA, Phil. N. C. teste Sow. Ovate-heart-shaped, imequi- 
lateral, subventricose, thinnish, white, variegated by chestnut-brown 
angularly flexuous lines and spots; with groove-like concentric striz, 
which are chiefly conspicuous posteriorly ; lunule large, heart-shaped, 
defined by an impressed line, adorned with a chestnut or livid purple 
spot; anterior slope veined with chestnut; inside wholly whitish, its 
margin entire. 1...13. Brazil. Hinge as in C. leta. 
CyrHEeREA Hinpstr (t. 15, f. 35), Hanl. 7. P. 1844, p. 110.—Sow. 
Th. 2, p. 614, t. 128, f. 27.—Tricona H. Desh. Vener. p. 53. 
‘Triangular, ventricose, rather solid, smoothish, glossy, subequilateral, 
whitish, clouded with brown, blunt at each extremity; hinder side 
very slightly the larger; beaks incurved, pale; lunule large, some- 
what inconspicuous, wholly pale; anterior slope streaked with brown ; 
inside whitish, edge entire. 1...1. Guyaquil. 
CyTHEREA Puitipprnarvo (t. 15, f. 36), Hanl. Z. P. 1844, p. 110. 
—Sow. Th. 2, p. 627.—Meretrix P. Desh. Vener. p. 39. Cordate, 
inequilateral, ventricose, thickish, variegated with narrow rays and 
angularly flexuous lines of purplish liver-colour on a paler ground of 
the same hue; with crowded narrow convex ribs, whose intervals are 
smooth; lunule short, white, heart-shaped; ventral edge entire, 
arcuated; inside whitish, with a livid spot beneath the umbones. 
4...1. Philippines. Dorsal edge margined with livid purple. 
CYTHEREA PLEBEIA (t. 15, f. 37), Hanl. Z. P. 1844, p. 109.— 
Circe p. Sow. Th. 2, p. 653, t. 138, f. 33 to 37.—Cy. ERyTHREA, 
Jonas, in Phil. N.C. teste Sow. Suborbicular, squarish, very inequi- 
lateral, solid, slightly compressed, externally variegated with fulvous 
on a dirty whitish ground, internally liver-coloured ; with very crowded 
concentric sulci; ligamental edge convex, and somewhat sloping; 
front dorsal edge very slightly retuse, much sloping; ventral margin 
arcuated, somewhat crenulated ; umbones not flattened, devoid of di- 
verging striz ; lunule white, lanceolate. 1...14. Philippines. Minute 
tawny zigzags adorn the whitish ground of the posterior surface; the 
Sulvous hue predominates anteriorly. 
On Arrenis (p. 106). Consult the monographs by Reeve (Conch. 
Je.), Sowerby (Th. Con.), and Deshayes (British Museum Catalogue). 

