344 TESTACEOUS MOLLUSCA. 



On Cokbula (p. 45). Reeve has published a monograph of this 

 genus (Conch. Icon.). Consult, likewise, D'Orbigny's Cuba Shells, 

 Zeit. Mai. 1844, 1846, 1848, Annals of the Lyceum of N. York, 

 vol. 5, the J. Conch, vol. 1 (for Eucharis elliptica), and Gr. Adams' 

 ' Contributions to Conchology.' 



Corbula sulcata, p. 45, t. 13, 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, 1. 10, f 53 ... C. cotitracta, 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, f. 52 ... C. Binghami, p. 47, t. 12, 

 f. 4. 



Corbula fasciata (t. 12, f. 27), Hinds, Z. P. 1843, 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 3 broad rays 

 of reddish or chocolate-brown on an ochraceous ground, sometimes 

 wholly yellowish white or rufous - brown ; ventral edge partially 

 arcuated. ^. 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, /. 1, 2, 3. — 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. t2"«tt- 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 in my examples is wholly white ; it is 

 said by Hinds to be fuscous. 



Corbula rosea (t. 12, f. 33), Brown, II, C. B. 105, t. 42,/. 2.— 

 Loven, Mol. Scan. 49. — Br. Mol. I, p. 185, t. 9, /. 13, 4. Oval- 

 sub trigonal, 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 \. N. Europe. 



Corbula pygboba (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 lyrae and 



