42 TESTACEOUS MOLLUSCA. 
p-78..—W. t. 3. f. 17. Sub-orbicular, convex, depressed, thin, 
purplish-white, with chesnut letter-like spots; beaks contiguous 
and rayed.— Africa ?—Variety ? Ch. f. 1957, 8. 
A. ALBEeLLuUM. Zam. 5. Elliptic, thin, pellucid, smooth, white 
and shining: both the cardinal tooth and the pit minute.: 4. — 
South Seas. 
A. Boysu.* Lam. 7..-Mactra B. Mont. t. 3. f. 7.—D. p. 
143.—W. t. 6. f. 27. Transversely ovate, sub-triangular, de- 
pressed, rounded at both ends, the beak considerably nearer the 
posterior extremity, sloping from the beaks on both sides, glossy, 
pellucid, margin rather suddenly rounded ; hinge with a single 
umbonal denticle in each valve, and broad, lateral, elevated teeth on 
each side of it in one of the valves. +.—ngland.3 
A. Tenus.* Zam. 8.—Turt. B. p. 53.—MacrraT. D. 
p. 143.—Dor. Cat. p. 33.—Mont.t. 17. f.7.—W. t. 6. f. 26. 
Sub-triangular, equilateral, compressed, with the ventral margin 
rounded, white, and concentrically wrinkled ; beaks produced and 
central ; hinge with one bifurcated and a remote lateral tooth in one 
valve, and a single plain one in the other. 1.—Hngland, §'c.4 
A. Prismaticum.* Lam. 10.—Mya P. D. p. 47.—Mont. 
t. 26. f.3.—W.t. 2. f. 21. Transversely oblong, attenuated at 
one end and rounded at the other, irridescent, thin, transparent, 
glossy, the margin slightly rounded, with obsolete concentric 

3 In general appearance, the genus Cumineia of Sowerby, bears 
a close resemblance to this, and the cognate species formerly 
grouped as Ligula by Montague. 
CUMINGIA. Son. 
Inequilateral, equivalve, posterior side rounded, anterior rather 
acuminated ; in each valve a single small posterior cardinal 
tooth, in one valve two lateral, but none in the other, a some- 
what spoon-shaped pit containing the ligament : muscular scars 
distinct, the posterior irregular and oblong, the anterior rounded, 
the palleal with a large sinus. 
Mr. Reeve, in plate 49 of his elegant Conchologia Systematica, 
figures the following species described by Sowerby in the Zool. 
Proc. for 1833.—Mutica, Trigonularis, Lamellosa, Coarctata. Com- 
pare with these the Californica of Conrad in Jour. A.N.S. Phil. 7— 
t. 17. f. 12. and the Tellinoides of Gould in his admirable work on 
the Invertebrata of Massachussets. The latter shell we likewise 
have figured. 
4 A. Phaseolina, Lam. 11. isa Thracia, A. Corbuloides, Lam. 12. 
an Osteodesma, A. Glabrella, Lam. 13. a Mesodesma, A. Physoides, 
Lam. 16. an Erycina, and A. Flexuosa, Lam. 11. is the same as his 
Lucina. 
