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186 American Seashells
Orbigny is /4 to /4 inch in length, with its umbilicus not so much covered,
and it may be only a form of this species.
Polinices ififmaculatus Totten Immaculate Moon-shell
Gulf of St. Lawrence to North Carolina.
% inch in length, subovate, smooth, milk-white and glossy when deprived
of its thin greenish-yellow periostracum. The ivory-white, thickened
callus does not encroach upon the small, round, deep umbilicus. Operculum
corneous, thin, light-brown. Commonly dredged off New England, and
often found in fish stomachs.
Polinices bnmneiis Link Brown Moon-shell
Southeast Florida (rare), West Indies (Texas?).
Plate 5)
I to 2 inches in length, heavy, glossy-smooth, with a deep, white umbilicus
and small, low spiral callus. Exterior tan to orange-brown. Operculum
corneous, thin, amber-brown.
Polinices uberinus Orbigny Dwarf White Moon-shell
North Carolina to southeast Florida and the Caribbean.
^ inch in length, very similar to lacteiis, but the umbilical opening is
larger, the callus is button-shaped and located against the columella near the
center, and there is a large, rounded ridge running back from the callus into
the umbilicus. Commonly dredged from 15 to 100 fathoms. Rarely in beach
drift.
Subgenus Neverita Risso 1826
Polinices duplicatus Say Shark Eye
Cape Cod to Florida and the Gulf States.
Plates 5k; 22h
I to 2>2 inches in length, glossy-smooth; umbilicus deep but almost cov-
ered over by a large, button-like, brown callus. Color slate-gray to tan; base
of shell often whitish. Columella white. The shell is generally flattened and
much wider than high, but some specimens (pi. 2 2h) are as wide as high and
globose in shape. Operculum corneous, brown, and thin. This is a very common
sand-lover found along our eastern coasts. Compare young specimens
with Natica livida.