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476 American Seasbells
Cuspidaria rostrata Spengler Rostrate Cuspidaria
Cape Cod, Massachusetts, to the West Indies.
Plate 32
% to I inch in length, with a tube-Hke rostrum which is ^ the length
of the entire shell. The rostrum points slightly downward. Shell fairlysmooth
with moderately coarse, concentric growth lines. Whitish in color
and sometimes with granular lumps of gray mud attached to the rostrum.
A^ioderately common in deep water (65 to over 1600 fathoms).
Cuspidaria jeffreysi Dall Jeffrey's Cuspidaria
Southern Florida and the West Indies.
Ys inch in length, smoothish with only fine lines of growth. Rostrum
moderately long; main part of shell round and fat. Similar to glacialis in the
north which, however, is larger, more compressed, and whose rostrum points
slightly downward instead of directly posteriorly as in this species. Creamy
white in color. Uncommonly dredged in waters over 100 fathoms off Miami.
Subgenus Leiovtya A. Adams 1864
Cuspidaria granidata Dall Granulated Cuspidaria
Off A4iami, Florida, and the West Indies.
% inch in length, similar to jeffreysi, but snow-white and covered
with numerous, small, opaque-white granules. Uncommon from 30 to 100
fathoms.
Genus Cardiojnya A. Adams 1864
With strong, sharp radial ribs; fossette more vertical and prominent,
otherwise like Cuspidaria.
Cardioviya costellata Deshayes Costate Cuspidaria
North Carolina to south Florida and the West Indies.
% inch in length, fragile, with a short rostrum, and with a few prominent
radial ribs just in front of the rostrum which gives the ventral margin
of the valve in that area a scalloped edge. Anteriorly, the radial ribs are closer
together, but weaker, and are rarely present at the anterior end of the shell.
Additional ribs may develop in older specimens and become more even in
size. (C. midticostata Verrill and Smith may be the old form and C. geirnna
Verrill and Bush the young form.) Commonly dredged off eastern Florida.
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