TRIBE SOLENIBvE. 15 



elevated sub-direct internal cross-bar extending from the hinge but 

 half way to the margin. 1 . .2. — lied Sea. — Epidermis very thin. 



S. Candidus.* Renieri. — Ch. /. 43. — S. Strigilatus of 

 British authors. Elongated oblong, breadth twice and a half the 

 length, ends rounded, uniform white, marked with coarse ridges of 

 growth, and anteriorly with curved radiating strigils : beaks sub- 

 central, anterior slope with divaricating striee; ventraledge straightish, 

 sub-incurved in the middle : an oblique and an erect tooth in each 

 valve (in one valve the former rudimentary) : nymphse distinct, i. . 14. 

 — Mediterranean, i)V. 



S. Solidus. Gray. Spic. Z. t. 3./. 12. Solid ovate, narrower 

 anteriorly, rounded at both ends, dull white, convex, with obsolete 

 concentric wrinkles : umbones convex, sub-posterior, dorsal edge 

 sinuated : two short and elevated teeth in each valve, the posterior 

 straight and sub-bifid, the other oblique : inside white. If . . 2\. 

 — Peru. 



S. Inflexus. Wood. G. C. t. 32./. 1, 2.—B. p. 62.— W. t. 

 3./. 18. Elongated-oblong, greenish white under an orange-brown 

 epidermis, posteriorly broader, anteriorly more than twice as long as 

 posteriorly, ventral margin inflected, nearly smooth : inside white, 

 two teeth in one valve and one in the other, besides a prominent 

 convex radiating rib. 1 . .3. 



S. Orbiculatus. Gray in W. S. f. 4. — Psammobia 0. 

 Desk. Mag. de Z. 1839. Mol. t. 7. Rounded-ovate, narrower, 

 nearly smooth, polished, much shorter and obliquely rounded 

 posteriorly, not at all angulated, under an uniform yellowish-olive 

 cuticle white ; hinge with an acute and semicircular tooth in one 

 valve, an acute and a sub-laminar tooth in the other ; the nympjiee 

 internally distinct. H . . ^. — S. America ? 



S. Costatus. Say. Jour. A. N. S. Phil. 2. p. 315. — S. 

 Sayii. Grif. Cuv. Mol. t. 31. — Solecurtus C. Say. Amer. 

 Cone. t. 18.— Conrad. Am. C. t. 24./. 2. Elongated elliptical, 

 very compressed, smooth, anterior side thrice as long as posterior ; 

 very thin, rounded at each end, under a yellowish olive cuticle pale 

 violet red, with not mpre than three whitish rays : teeth two (some- 

 times obsolete) in eadi valve, the posterior one upright, the other 

 bent forwards : an internal direct longitudinal rib spreading and 

 becoming obsolete towards the ventral edge. 1 \. — New Jersey. 



S. Medius. Sow. in Beechey Zool. t. 43. /. 2. — Mach^era 

 Nitida. Gould Mas. p. 33. /. 25,6. Oblong, ligamental edge 

 elongated and straightish, ventral slightly curved, posteriorly 

 rounded and very short, anteriorly sub -attenuated and obtuse, smooth 

 white or livid under a greenish or brownish yellow shining cuticle : 

 inside white, with a posterior cross-bar : three teeth in one valve, 

 two in the other. 2\. — N. America. 



S. Maximus. WoodG. 0.31./. 3.— W.t. 3./ 16.— S.Gigas, 



