16 TESTACEOUS MOLLUSCA. 
7),61.—Soxiecurtus Nurrauiu. Conrad inJ. A. N. 8. Phil. 7. 
Jide Gould. Linear-oval, sub-diaphanous, rounded, equally broad at 
both ends, flat, under a glossy olive green epidermis white, rounded 
at both ends; nearly smooth : inside white with a strong longitu- 
dinal rib extending from the hinge to the margin: hinge twice 
as near the posterior as the anterior, two remote and lamellar teeth 
in one valve, four in the other. 2..5.— Sandwich Isles. 
S. Brpens*. Chem.—S. Fraeiuis. Mont.—D. p. 65.— 
Turt. B.t.8.f.3.—W. t. 3. f. 11.—Ch. f. 1939. Linear-oval, 
nearly smooth, pellucid, brittle, white under a yellowish cuticle, a 
reddish brown longitudinal stripe extending half way to the margin, 
but becoming broader and fainter as it recedes from the hinge : 
margins sub-parallel, the ventral sub-incurved in the middle: two 
teeth in one valve one in the other, }..13.— Nicobar Isles, §'c. 
S. Tenuis. W.S.¢t. 1. f. 5. (not of Grif. Cuv.) Elongated 
oblong, thin, rounded at the ends, thrice as broad as long, ventral 
edge incurved in the middle, white under a dirty yellowish cuticle: 
hinge, in one valve with a single projecting falcate tooth, a small 
tooth with a denticle on each side in the other: inside uniform 
white, without a rib, but with an oblique anterior radiating callus. 
Lees 
S. Novacutina. Benson. Elongated-oblong, obtuse at both 
extremities, thin, dull white under an ochraceous epidermis, nearly 
smooth, ventral and dorsal edges sub-parallel and scarcely at all 
arcuated: beaks slightly prominent, broad, situated at about 3rd 
from the somewhat narrowed posterior extremity: inside glossy, 
often irridescent, teeth very small. 2..14.—Near Calcutta. 
S. CaLrrorNIANUS—CULTELLUS C. Conr. Jour. A. N. S. 
Phil. 7. p. 233. t. 18. f. 3. Linear, oblong-oval, thinnish, convex, 
dorsal and ventral edges parallel, the latter incurved in the middle, 
equally rounded at the sides, under a straw-coloured cuticle with 
radiating wrinkles on the anterior slope, white tinged with yellowish 
brown, with direct brown lines in the middle. 33.—U. California. 
Allied to Dombet. 
S. Susreres.—Cutreius 8. Conr. Jour. A. N. 8. Phil. 7. 
p. 233. t. 17. f. 10. Linear-oval, inflated or sub-cylindrical ; dor- 
sal and ventral edges sub-parallel, slightly arcuated, beaks very 
obtuse, extremities equally rounded, under a yellowish brown finely 
wrinkled cuticle, pale purple obscurely rayed : two teeth in each 
valve, the anterior one of the right valve dilated. 3. . 23.—U. Cali- 
fornia.— Not impossibly the young of Dombei or Californianus. 

1 The S. Minrmus of Ch. f. 31. (of which we have given a copy) 
—D.p. 66.—W.t. 3. f. 19.—is evidently the young of a species 
allied to this. 
