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TROCHIDAE 117
Indies, Although fairly good specimens are found without their soft parts
in southern Florida and Bermuda, this species has been extinct in those areas
for several hundred years. Living individuals may be found abundantly in
the West Indies where they are used in chowders by some people. Cittariwn
Philippi 1 847 is this genus.
Livona pica Linne West Indian Top-shell
Southeast Florida (dead) and the West Indies (alive).
Figure 3:]
2 to 4 inches in length, heavy, rather rough, and with splotches of pur-
plish black on dirty-white. Umbilicus round, narrof and very deep. Inner
edge of lip with rich cobalt-blue mottlings. Operculum horny, large, round,
multispiral and opalescent blue-green in life.
—Ten+ac(e
Figure 34. West Indian Top-shell, Livona pica Linne. a, shell with animal extended
(3 inches); b, outline of head X2. (From Clench and Abbott 1943
in Johnsonia.)
Genus Norrisia Bayle 1880
Norrisia norrisi Sowerby Norris Shell
Plate 1 8m
Monterey, California, to Lower California.
1 34 inches in length, slightly wider, heavy, smoothish with a glossy
finish, especially on the underside. Lip sharp. Aperture thickened within
and pearly. Umbilicus ovate, very deep, colored a greenish blue on the
columellar side, bordered on the other side by glossy black-brown which
fades into rich chestnut over the remainder of the shell. Operculum, multispiral,
externally ornamented with spiral rows of dense bristles. Animal
tinged with red. Moderately common among the kelp weed beds.