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470 American Seash ells
compressed. Beaks tiny, quite near the rounded anterior end. Right valve
smoothish and transkicent cream. Left valve more prominently divided into
2 portions by a slight radial groove, anterior to which the shell is dull cream,
and posterior to which the shell is more glossy but with microscopic concentric
growth lines. Sometimes slightly iridescent. Interior pearly. Mod-
erately common in sand below low water to 60 fathoms.
Pandora arenasa Conrad, the Sand Pandora, (Carolinas to southeast
Florida) is commonly dredged by amateurs. It is very much like trilineata,
but never over /^ inch in length, completely lacking the rostrum and with
a quite convex left valve which has an external radial rib below the hinge
margin ridge. Common. P. carolinensis Bush is this species.
Figure 96. Atlantic Pandoras, a, Pandora bushiana Dall, 1^ inch (Florida); b,
P. trilineata Say, % inch (Atlantic Coast); c, P. gouldiana Dall, i inch (northern
Pandora gouldiana Dall
Atlantic Coast).
Gulf of St. Lawrence to Cape May, New Jersey.
Gould's Pandora
Figure 96c
% to I % inches in length, similar to trilineata, but less elongate with the
height slightly more than half the length. The posterior rostrum on the hinge
line is very short, stubby and turned up. The shell is opaque, chalky and
commonly worn away, showing the pearly underlayers. Margin of valves
bordered with blackish brown periostracum. Common from intertidal areas
to 20 fathoms.
Subgenus .
Kennerlia Carpenter 1864
Pandora filosa Carpenter Western Pandora
Alaska to Ensenada, Lower California.