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LUCINIDAE 389
The subspecies centrifuga Dall, from Lower California, has stronger and
distantly spaced, concentric, raised lines.
Subgenus Lucinoma Dall 1901
Fhacotdes filosus Stimpson Northeast Lucina
Newfoundland to north Florida and the Gulf States.
Plate 38); figure 78a
1 to 3 inches in length (south of North Carolina rarely over i ^ inches)
almost circular, compressed, white, with a thin, yellowish periostracum.
Beaks small, close together and centrally located. Sculpture of sharp, raised,
thin, concentric ridges each about % inch apart. The young commonly lack
these ridges. No anterior lateral tooth present. Common offshore. Do not
confuse with pectinatiis which has a strong anterior lateral tooth, is tinted
inside with orange and whose concentric ridges are unevenly spaced.
Phacoides annulatus Reeve Western Ringed Lucina
Alaska to southern California.
Figure 28f
2 to 2% inches in length, oval to circular and slightly inflated. With
strongly raised, concentric threads about Viq inch apart. Shell chalky-gray
to white, overlaid by a thin, greenish-brown periostracum. Fairly commonly
dredged from 8 to 75 fathoms. The Tertiary fossil species acutilineatus Con-
rad may be the same.
Genus Anodontia Link 1807
Shell large, obese, fairly thin and subcircular in outline. Hinge without
distinct teeth. Anterior muscle scar long and parallels the pallial line.
Anodontia alba Link Buttercup Lucina
North Carolina to Florida, the Gulf States and West Indies.
Plate 38f
1% to 2 inches in length, oval to circular, inflated and fairly strong.
Hinge with very weak teeth, the posterior lateral being the most distinct.
Exterior dull-white with weak, irregular concentric growth Hues. Interior
with a strong blush of yellowish orange. A common species used in the
shellcraft business. This is Lucina chrysostoma Philippi.
Anodontia pbilippiana Reeve Chalky Buttercup
North Carolina to east Florida, Cuba and Bermuda.
Plate 386
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