TRIBE SOLENIDvE. 1/ 



S. Acutidens. Sow.tf' Brod. Z. J. 4. — Reeve t. 26. f 2. — 

 Beechey. Zool. t. 43. f 2.— S. Michaudi. Call, in Mag. de Z. 

 1839. Mol. C.2. Linear, ventral and dorsal margins sub-parallel, 

 the former sub-incurved in the middle, sides rounded ; thin, white 

 under a green epidermis : hinge at one third the distance from the 

 posterior end, the teeth narrow, in one valve two small ones, a long 

 and a very small one in the other. J.. 3. — Sumatra, India. 



S. Acuminatus. Nobis, in Z. P. 1842. Elongated, breadth 

 rather more than thrice the length, posteriorly rounded, anteriorly 

 attenuated but rounded at the tip, dorsal and ventral edges both 

 curved, the latter with a sub-medial incurvation ; white under 

 a greenish-grey epidermis : two narrow teeth in each valve, one 

 much the smaller. -J. . 2-J. — India. 2 



2 The genus Glauconome is considered as belonging to the Sole- 

 nacese by Mr. Reeve in his system of Conchology, an opinion I 

 am the more inclined to assent to, from knowing that Linneus has 

 already described one of its species under the name of Solen Virens. 

 (1115.— D. p. 70.) 



GLAUCONOME. Gray. 



Oblong-oval, thin, equivalve, inequilateral, margins closed, 

 covered with a horny cuticle : three cardinal teeth in each valve, 

 the anterior the larger, the middle of the right and the anterior 

 of the left bifid, no lateral teeth ; a 'posterior marginal oblong, 

 and an anterior sub quadrate muscular impression, the palleal 

 with a large broad and deep oblong sinus : ligament external, 

 oblong. 



G. Chinensis, Gray. Spic. Z. — Sow. G. — Reeve, t. 31. 

 Nearly smooth, anteriorly attenuated, posteriorly rounded, cuticle 

 thin and green. J-. . l£. — China. 



Mr. Reeve places the genus Solenella of Sowerby with the 

 Solenaceae, a position which at first, from the peculiar structure of 

 its teeth, I felt disposed to cavil at, but whose correctness sub- 

 sequent observation has confirmed. 



SOLENELLA. Sowerby. 



Transversely-oval, sub-equilateral, equivalve, compressed, shining, 

 with a thin olive cuticle : in each valve three or four continuous 

 posterior lateral teeth, and an anterior sub -direct row of small sharp 

 pointed ones ; muscular scars rather distant, the palleal with a 

 large sinus : ligament external and elongated. — S. Nourish. Sow. 

 Z. P. 1832.— Sow. G.- Reeve, t. 30. Bluish-white under an 

 olive-green cuticle with darker zones, smooth. #..l-f. — Valparaiso. 



The genus Pholadomya of Sowerby is adopted by jjeshayes. 

 Its characters are as follows : 



