344 TESTACKOUS MOLLUSGA. 
On Corsuta (p. 45). Reeve has published a monograph of this 
genus (Conch. Icon.). Consult, likewise, D’Orbigny’s Cuba Shells, 
Zeit. Mal. 1844, 1846, 1848, Annals of the Lyceum of N. York, 
vol. 5, the J. Conch. vol. 1 (for Hucharis elliptica), and G. Adams’ 
‘ Contributions to Conchology.’ 
Corbula sulcata, p. 45, t. 18, f. 48... C. Tahitensis, p. 46, t. 12, 
f. 30... C. porcina, p. 46, t. 12, f. 47... C. bicarinata, p. 46, t. 12, 
f. 31... C. rostrata, p. 46, t.10, f 53... C. contracta, p. 47, t. 9, f. 34 
..» C. Mediterranea, p. 47, t. 12, f. 43 ... C. biradiata, p. 47, t. 10, 
f. 51... C. ovulata, p. 47, t. 10, £.52... C. Bingham, p. 47, t. 12, 
fA: 
CorBULA FASCIATA (t. 12, f. 27), Hinds, 7. P. 18438, p. 59.—Reeve, 
I. Cor. f. 12. Transversely oblong, subequilateral, somewhat at- 
tenuated at both extremities, rounded at one end, bluntly angulated 
at the other (towards which the beaks incline); both valves smooth, 
or nearly so, thin, subventricose, shining, usually with 38 broad rays 
of reddish or chocolate-brown on an ochraceous ground, sometimes 
wholly yellowish white or rufous-brown; ventral edge partially 
arcuated. 4. Philippines. In the rufous variety (here figured ) the 
umbonal ridge is subcarinated, and the central ray quite obsolete. 
CorBULA crassa (t. 12, f. 29), Hinds, Z. P. 1843, p. 55; Sulp. 
p. 67, t. 20, f. 1, 2, 8—Reeve, I. Cor. f. 8. Peaked-oval, dorsally 
angular, solid, scarcely inequilateral, wholly white; umbones smooth, 
elsewhere lyrated with numerous concentric ridges, which are coarse, 
except on the concave anterior slope, which latter is defined by an 
angle; anterior extremity narrowed, and obliquely biangulated ; pos- 
terior end rounded; ventral edge of the larger valve overlapping the 
other in front; beaks acute, inclined. -7,...44. Malacca; Philip- 
pines. In aged specimens the ventral increase is more conspicuous 
posteriorly. A minute decussation between the ridges is perceptible 
with a strong glass. The inside ir my examples is wholly white ; it is 
said by Hinds to be fuscous. 
CorBuLA RosEa (t. 12, f. 33), Brown, Il. C. B. 105, t. 42, f. 2.— 
Loven, Mol. Scan. 49.— Br. Mol. 1, p. 185, t. 9, f. 18,4. Oval- 
subtrigonal, subequivalve, subequilateral, subventricose, attenuated 
at each extremity, rounded at one end obtusely, and subbiangulately 
pointed at the other, subarcuated ventrally; glossy, fulvous, with a 
short dark roseate streak diverging from the umbo on both sides in 
each valve. Smaller valve smooth; larger valve simply and closely 
grooved concentrically, chiefly so near the margin: umbonal ridge 
obsolete. Nearly 4. N. Europe. 
CorBULA PYGMHA (t. 12, f. 34). Oblong, attenuated and obliquely 
truncated in front, uniformly whitish both within and without, every- 
where decussated by densely disposed concentric rugiform lyre and 
