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LUCINIDAE 385
monly with a thin, yellowish gray periostracum. Irregular coarse growth
hnes present. Uncommon from 4 to 139 fathoms. Closely related to T. dis-
juncta Gabb, if not that species.
Fainily LUCINIDAE
Genus Li^cina Bruguiere 1797
Shell orbicular, strong and laterally compressed. Cardinal teeth small,
obscure in the adults, but the laterals are well-developed. The use of Lucina
here is based on Anton's designation of pensylvanica Linne as the genotype.
The genus Linga Gregorio is this genus.
Subgenus Lucijia s. str.
Lucina pensylvanica Linne Pennsylvania Lucina
North Carolina to south Florida and the West Indies.
Plate 38h
I to 2 inches in length, ovate, usually quite inflated. Concentric ridges
very delicate and distinct. Color pure-white with a thin yellowish periostra-
cum. Lunule heart-shaped, well-marked and raised at the center. The furrow
from the beak to the posterior ventral edge of the valve is very pronounced.
Beachworm specimens become smooth and shiny-white. The
species name was incorrectly spelled by Linne. Moderately common in shallow
water.
Subgenus Here Gabb 1866
Lucina sonibrereiisis Dall Sombrero Lucina
Southern Florida.
Figure 78b
^4 inch in length, oval, greatly inflated and pure white in color. No
radial sculpture. Concentric riblets numerous, sharp and irregularly crowded.
Concentric growth irregularities commonly make the outer surface wavy.
Commonly dredged off Miami from 20 to 90 fathoms.
Subgenus Bellucina Dall 1901
Lucina aiitiaiitus Dall Lovely Miniature Lucina
North Carolina to both sides of Florida.
Figure 78c
% to % inch in length, not quite so high, quite obese, thick-shelled, purewhite
in color and beautifully sculptured with 8 to 9 wide, rounded, radial
ribs across which run numerous, small concentric riblets. Near the posterior
upper margin of the shell there is a radial row of about 8 to 1 1 small, scale-