TRIBE SOLENID/E. 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. Tiiuelcha, 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, j- . .23. — S. America. 



* * Hinge not i quite central, 



S. Pygmeus.* Lam. 6. — S. Pellucidus. Pen. 4. t. 46. f. 22. 

 — Mont. p. 49.— Turt. B. p. 83.— D. p. 60.— W. t. 3./. 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, j . . 1. — Erance, fyc. 



S. Ambiguus. Lam. 7. — E. vol. 3. p. 960. — Deles, t. 2.j\ 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, f ..4. — America? 



S. Cultellus. Lin. 1114. — D.p. 61. — Lam. 8.— Ch.f. 36, 37. 

 — E. 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. — Indian Ocean. 



S. Planus. Lam. 9. — S. Maximus. Gmel. 15. — Ch.f. 35. 

 —E.t. 223./. 5— S. Magnus. 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-J. . 4. — India. 1 



* * * Hinge nearly central. 



S. Legumen.* Lin. 1114.— D.p. 61.— Lam. ll.— Ch.f.32, 

 3, 4.— Don. t. 53.— Mont. p. 50.— IT. t. 3. /. 8.— Psammobia. 

 L. Turt. D. 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, f . . 4. 

 — Atlantic. 



S. Dombei. Lam. 12. — E. t. 224. f. 1. Linear-oval, strong, 

 ventral margin incurved towards the middle, under the cuticle dull 



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



