TRIBE CONCHACEA. VI7 
terior tooth rudimentary in one valve : margin crenated. 14..12. 
— Panama. 
V. Rapiata. Chemnitz. f. 386.—D. p. 189.—W. t. 8. f. 69. 
Triangular heart-shaped, with decussated striee, the longitudinal 
more distinct posteriorly; white with interrupted brown rays, 
and the anterior slope usually streaked with brown : umbones 
often stained with violet, the beaks recurved: lunule defined by a 
heart-shaped line ; inside white, the margin crenulated. 2. .1.— 
West Indies. 
V. Prepares. Say. Jour. A. N. S. Phil. 2. p. 271.—V. 
Notata. Gould. Mas. f. 67.—do. Say? Subovate, dirty white 
with zigzag blotches of liver brown, and numerous elevated subacute 
parallel concentric lines, becoming mere wrinkles near the suture 
of the anterior slope and obsolete on the disc, interstices plain : an- 
terior slope flattened, margined by an acute line; anterior margin 
with an obsolete longitudinal very obtuse undulation, which gives the 
tip of this margin a slightly truncated appearance ; areola cordate, 
elevated at the suture: inside white or yellowish. 23.—United 
States. 
V. Sturcupuri. Gray. in W. S. t. 2. f. 4.—V. Catuosa. 
Conrad. Rounded heart-shaped, convex, moderately thick, chalky 
white, with radiating ribs and concentric elevated striz, except 
upon the anterior slope, which is devoid of both; no lunule: inside 
stained anteriorly with purple, the edge crenated. 1}..13.— 
Sandwich Isles. 
V. Decorata.. Brod. 5 Sow. Z. J.5. Sup. t. 40. f. 3.— 
Beechey. Zool. t. 41. f. 9. Triangular-cordate, anteriorly pro- 
duced, white, decussated by fine transverse crenulated riblets, and 
radiating sulci. 
V. Spissa. Quoy. Ast. t. 84. f. 7, 8. Transversely ovate, 
subequilateral, transversely wrinkled, brownish white with one or 
two indistinct darker rays, the umbones minute and little promi- 
nent ; lunule ovate oblong, defined by an impressed line; within 
except the disc, violet, the margin finely crenated.— Nem Zealand. 
V. Unparetia. Sow. Z. P. 1835. Rounded elliptic, thick, 
whitish with brown spots dots and waved markings, and crowded 
radiating riblike strize, which are decussated by undulated and sub- 
lamellar ones: posterior side the shorter, anterior rather sloping, 
margins depressed; ventral: edge rounded, crenulated within. 
13... 13.— California. 
V. Purrcarta. Brod. Z. P. 1835. Subtriangular, with very 
numerous raised delicately plaited concentric lines; white with 
chesnut scattered spots often arranged in angular figures: dorsal or 
anterior area, with blackish chesnut streaks: lunule brown; inside 
purplish, whitish towards the crenulated margin. 12..14.—W. 
Columbia. 
V. Discrepans, Son. Z. P. 1835. Elliptic, thick, whitish 
