, FAMILY SOLENIDZ — SOLECURTUS. 243 
(EXTRA-LIMITAL.) 
S. viridis. (Say, Ac. Sc. Vol. 2, p. 316. Conrap, Mar. Conch. pl. 5, fig. 2, Puare 33, fig. 312 
of this book.) Shell transversely oblong, compressed. Hinge-margin nearly straight: basal 
margin rounded ; posterior end obliquely truncated, a little reflected and rounded near the base; 
anterior end rounded. Surface smooth, with very slight concentric lines, marking the various 
stages of growth: hinge terminal. A singletooth in each valve, having a flattened vertical surface: 
which turns upon that of the opposite tooth. Color: epidermis pale green, becoming olivaceous 
with age. Vertical axis, 0-4; transverse, 2:0. Southern coast. 
Genus Lepton, Turton. Shell flat, nearly orbicular, equivalve, inequilateral, a little open at the 
sides. Hinge of one valve with a single tooth, and a transverse linear lateral one, each side ; 
the other valve with a cavity in the centre, and a transverse deeply cloven lateral tooth each 
side, the segments of which divaricate from the beak: ligament internal. 
L. fabagella. (Conrap, Mar. Conch. p. 51, pl. 11, fig. 3. Puare 82, fig. 307, a. 3. of this book.) 
Shell very small, suboval, convex, with minute crowded concentric lines; beaks central, rather 
prominent. Epidermis thin and wrinkled: teeth similar in each valve; the posterior tooth longest, 
and angulated under the beak. Color: epidermis yellowish. Vertical axis, 0°3; transverse, 0°4. 
Rihode-Island. 
GENUS SOLECURTUS. Blainville. 
Animal too large for its shell. Lobes of the mantle thick in front, united and elongated in 
its posterior half into two large unequal siphons, which are united very near the summit. 
Foot tongue-shaped, large, very thick. Labial appendices very long and narrow. Branchize 
narrow, very long, extending through the whole length of the branchial siphon. Shell 
transverse, elongated, equivalve ; the beaks small, subcentral. Margins nearly parallel ; 
ends abruptly rounded. Hinge with two or three cardinal teeth in each valve: ligament 
prominent, seated on thick callosities. Palleal impression with a very deep sinus. 
SoLEcURTUS CARIBAUS. 
PLATE XXXII. FIG. 302. 
(STATE COLLECTION.) 
Solen caribeus. Lam. An. sans vert. Vol. 2, p. 522. Ed. Brux. 
Solecurtus caribeus, CoNnrap, Am. Marine Conchology, p. 22, pl. 4, fig. 2. 
S. (Cultellus.) id. Gouin, Invertebrata of Mass, p, 30. 
Description. Shell thick and solid, transversely elongated, resembling in shape some species 
of Unio, rounded at both ends; the upper and basal margins nearly parallel, the latter 
compressed and slightly arcuated. Beaks obtuse and little elevated, and placed towards the 
31* 
