TRIBE SOLENID. 13 
nearly parallel, and tapering slightly from the hinge, which is quite 
terminal and consists of but a single tooth in each valve, white with 
pink concentric bands, abruptly truncated and thick posteriorly. 
5.—American Seas. 
S. Tauetcua, D’Orbigny. Linear, straight, tapering an- 
teriorly to a rounded termination, posteriorly sub-truncated, the 
edge convex; uniform white, polished, the epidermis dull yellow ; 
a single tooth in each valve. $..23.—S. America. 
** Hinge not quite central. 
S. Pyemeus.* Lam. 6.—S. Petiucipus. Pen. 4. t. 46. f. 22. 
—Mont. p. 49.—Turt. B. p. 83.—D. p. 60.—W. t. 3. f. 7. 
Pellucid, fragile, rounded at each end, hinge margin nearly straight, 
the ventral slightly curved ; a single tooth in one valve and two in 
the other, besides contiguous lateral processes. } .. 1.—Hrance, Sc. 
S. Amaicuus. Lam. 7.—E. vol. 3. p. 960.—Deles. ¢t. 2. f. 1. 
—Swain. Z. I. 1st ser. Linear, broad, nearly straight, margins 
parallel, whitish, sometimes with ochraceous rays, thick, anteriorly 
slightly rounded and obliquely truncated; umbones rather pro- 
minent, a single tooth in each valve. $..4.— America ? 
S. Cutretius. Lin. 1114.—D. p. 61.—Lam. 8.— Ch. f. 36, 37. 
—H. t. 223. f. 4.— W. t. 3. f. 9. Linear, oval, somewhat curved, 
thin, brittle, whitish with tawny spots under a brown epidermis, 
finely striated concentrically ; hinge with two teeth in one valve, 
a single one in the other. $..2.—Jndian Ocean. 
S. Pranus. Lam. 9.—S. Maximus. Gmel. 15.—Ch. f. 35. 
—H. t. 223. f. 5 —S. Maenus. D. p. 61.—W. ¢t. 3. f. 17. 
Linear, flattened, straight, sub-diaphanous, rounded at both ends, 
white under a yellowish epidermis, striated concentrically : hinge 
with two teeth in each valve, those of the left oblique and divergent ; 
an internal radiating rib proceeds from the hinge. 1}. .4.—Jndia.! 
** * Hinge nearly central. 
S. Legumen.* Lin. 1114.—D. p. 61.—Lam. 11.—Ch.f. 32, 
3, 4.—Don. t. 53.— Mont. p. 50.—W. t. 3. f. 8.—PsamMMosia. 
L. Turt. B. p. 90. Linear, rounded at both ends, hinge margin 
nearly straight, the ventral one slightly curved, so as to render the 
posterior end the narrower one; smooth, yellowish, thin, pellucid, 
brittle, with fine lines of growth ; hinge strengthened by an oblique 
internal rib, a single tooth in one valve, two in the other, with 
lateral teeth simple in one valve and winged in the other. #..4. 
—Atlantic. 
S.Domser. Lam. 12.—EH. t. 224. f. 1. Linear-oval, strong, 
ventral margin incurved towards the middle, under the cuticle dull 

1S, Minurvus, Lam. 10, is his Hiat. Arctica. 
