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430 American Seashells
Compare with lintea which lacks the dorsal crenulations. Formerly placed
in the genus Tellina.
Genus Quadrans Bertin 1878
Quadrans lintea Conrad Lintea Tellin
North Carolina to both sides of Florida and the West Indies.
Figure 86g
% to I inch in length, moderately oval, slightly inflated, quite strong
and all white in color. Posterior dorsal slope with 2 radial ridges in the
right valve, i in the left. Concentric lamellae numerous, sharp and minutely
raised. Left valve with 2 extremely weak, long laterals, but these are well-
developed in the right valve. Dorsal line of the palhal sinus meets the pallial
line not far from the anterior muscle scar. Posterior twist to the right is
fairly pronounced. Commonly dredged off the Carolinas (9 to 16 fathoms),
uncommonly found in a few feet of water on the west coast of Florida,
Formerly placed in Tellina.
Genus Tellidora H. and A. Adams 1856
Tellidora cristata Recluz White Crested Tellin
North Carolina to west Florida and Texas.
Plate 30-0
I to 1/4 inches in length, roughly ovate, compressed and all white.
The left valve is very flat, the right valve slightly inflated. Dorsal margins
of valves with large, saw-tooth crenulations. A bizarre clam found uncommonly
in shallow water.
Genus Macoma Leach 18 19
The Macomas are modified tellins which may be distinguished by (i)
no lateral teeth; (2) usually dingy-white in color and of a chalky consistency;
(3) there is a strong posterior twist; (4) the pallial sinus is larger in one valve
than the other.
Macoma calcarea Gmelin Chalky Aiacoma
Figure 88f
Greenland to Long Island, New York. Bering Sea to off Monterey,
California.
1% to 2 inches in length. Oval-elongate, moderately compressed, but
somewhat inflated at the larger, anterior half. Beaks % the way toward
the narrowed, slightly twisted posterior end. Shell dull, chalky-white. Con-
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