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122 American Seashells
Liotia fenestrata Carpenter Californian Liotia
Monterey, California, to San Martin Island, Mexico.
Plate i8u
Vs inch in diameter; spire low, shell solid; deeply and narrowly umbili-
cate. Aperture circular, pearly within. Ash-white in color. Characterized
by heavy cancellate sculpturing which makes the shell appear pitted by rows
of deep, squarish holes. Uncommonly dredged from lo to 25 fathoms. L.
cookeana Dall is not this species, as is commonly thought, but is a Cyclostrema.
Genus Arene H. and A. Adams 1854
Arene cruentata Miihlfeld Star Arene
Southeast Florida and the West Indies.
% inch in length, one third again as wide. 4 to 5 whorls angular with the
periphery bearing a series of strong, triangular spines which are hollow on
their anterior edges. Color white to cream with small, bright-red patches
on top of the whorl. Below the main row of spines there is a minor spiral
row of smaller spines. Suture channeled. Aperture circular, pearly within.
Umbilicus round, deep, and bordered by 3 spiral, beaded cords. Uncommon
under rocks.
The form vanhyningi Rehder from Sand Key, Key West, is pale gray-
white with most red patches absent. It lacks fine, axial ridges on top of the
whorl which are usually present in the typical form. Uncommon.
Arene venustula Aguayo and Rehder (Miami to Puerto Rico) is similar
to cruentata, but smaller, much more squat, chalky-white, and with two pe-
ripheral rows of blunt spines. The rows are very close to each other. Rare,
20 fathoms.
Arene gevmia Tuomcy and Holmes Gem Arene
North Carolina to south half of Florida to Brazil.
Plate lyq
% inch or less, turbinate in shape; 3 spiral rows of neat, tiny beads on
the squarish periphery. Suture minutely channeled and bounded below by
a spiral row of whitish beads. Top slope of whorls and base of shell flattish.
Axial threads on entire shell microscopic and crowded. Umbilicus round,
deep, bordered by 7 to 9 distinct beads. Color of shell white to tan with
minute specklings of red and/or brown. Commonly dredged from 3 to 100
fathoms.