APPENDIX. 345 
most minute crowded raised radiating lines; valves very unequal in 
size, the larger being produced in front and at the anterior ventral 
margin, the umbones nearly even; the smaller valve equilateral, its 
umbonal ridge more sharply angular, and the area before it more 
decidedly concave than in the other valve. . 
CoRBULA QUADRATA (t. 12, f. 36), Hinds, Z. P. 1848, p. 57.— 
Reeve, I. Cor. f. 40. Transyersely subquadrate, bluntly biangulated 
in front, very short and rounded behind, very prominent at the 
oblique and broadish umbenes, very inequilateral, whitish both 
within and without, concentrically wrinkled, granular; umbonal 
ridge arcuated and prominently carinated, the area before it con- 
cave; teeth slender, oblique. %. W. Indies. 
CoRBULA TRIGONA (t. 12, f. 39), Hinds, Z. P. 1848, p. 58.—Reeve, 
I. Cor. f.22. Small, oval-subtrigonal, subinequilateral, thickish, sub- 
ventricose; both valves smooth, both within and without whitish 
(more rarely brown, or with a single obsolete band), subventrally 
angulated on one side, subangulately rounded on the other; ventral 
edge arcuated and projecting in the larger valve. 3. Senegal. 
CorBULA NIMBosa (t. 13, f. 58), Hanl. (not Poramomya n. Hinds, 
Z. P. 1843, p. 59 = C.n. Reeve, Ic. Corb. f. 31 = Mya wastata, 
Maton, Lin. Tr.).—Poramomya, Sow. Man. f. 498, 9.—C. u. Reeve, 
Le. Corb. f. 28. Oval-subtriangular, subequilateral, rounded behind, 
ventrally angulated in front, nearly smooth, solid, subventricose, 
dirty (or reddish) white under a horny ochraceous epidermis; inside 
white. Valves very unequal, especially at the ventral margin, which 
in the larger valve is solid arcuated and much projecting beyond the 
other; its umbo, likewise, is the more prominent. Neither lunule, 
lozenge, nor carmated umbonal ridge. 4...13. Singapore. The 
epidermis of the smaller valve is apt to assume a clouded aspect ; there 
are some very indistinct radiating striole on the other valve. 
Myochama Anomioides, p. 48, t. 12, f. 3. 
Pandora oblonga, p. 49, t. 10, f. 46... P. depressa, p. 49, t. 10, 
f, 47... P. glacialis, p. 49, t. 10, f. 48 ... P. flexuosa, p. 49, t. 10, 
f. 49... P. unguiculus, p. 49, t. 10, f. 50... P. trilineata, p. 49, t. 9, 
f. 32... P. Ceylonica, p. 50, t. 10, f. 45. 
On Saxicava (p. 50). Conrad has subsequently referred his 
S. Carditoides and Californica (p.51) to the genus Petricola. S. pho- 
ladis (p. 51) is a variety of rugosa (of which S. distorta, Say, is a 
synonym): the types of S. Australis and its var. Veneriformis (p. 52) 
remind one of Cardite (I did not see their hinges). The genus 
Hiatella (p. 150) is redundant; its species must be transferred 
hither. SS. costata of Menke’s ‘Synopsis’ is not a true Saxicava: 
S. macrodon (Phil. in Zeit. Mal. 1851) and S. legumen (Desh. Rev. 
Cuy. 1839) should be examined. 
2D 
