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NATICIDAE 191
Subjainily NATICINAE
Genus Natica Scopoli 1777
Subgenus Naticarius Dumeril 1806
Natica canrena Linne Colorful Atlantic Natica
North Carolina to Key West and the West Indies.
Plate 5I
I to 2 inches in length, glossy-smooth, except for weak wrinkles near
the suture. Color pattern variable; sometimes with axial, wavy, brown lines
and with 4 spiral rows of arrow-shaped or squarish brown spots. Umbilicus
and its large round, internal callus white. Exterior of hard operculum with
about 10 spiral grooves. Uncommon in eastern Florida; common in the West
Indies.
Natica livida Pfeiffer Livid Natica
Southeast Florida, Caribbean and Bermuda.
Plate 22-0
% inch in length, glossy-smooth, exterior lead-gray with vague, spiral,
darker-gray bands. Aperture and columella brown; callus which almost fills
the umbilicus characteristically dark to light chocolate-brown. Moderately
common on intertidal sand flats. Do not confuse with Folinices duplicatus,
which is much flatter and has a corneous operculum, but which also has a
brown to purplish brown callus.
Subgenus Cryptonatica Dall 1892
Natica clausa Broderip and Sowerby Arctic Natica
Figure 43b
Arctic Ocean to North Carolina. Arctic Ocean to off southern Cali-
fornia.
I to I % inches, in length, fairly thin, smooth, yellow-white, with a
smooth, gray to yellowish-brown periostracum. Umbilicus sealed over by a
small, flat callus. Operculum, calcareous, thin, slightly concave, smooth,
white and paucispiral. Commonly dredged in moderately deep water, and
occasionally found intertidal north of Massachusetts. The sand-collar eggcase
has smooth edges, and has a pimpled surface caused by the small com-
partments of young.
Natica pusilla Say Southern Miniature Natica
Cape Cod to Florida, the Gulf States, and the West Indies.
Plate 22)
/4 to Va inch in length, glossy-smooth, similar to clausa, but more ovate,
often with a small, open chink next to the umbilical callus, and is a much