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The subspecies centrifuga Dall, from Lower California, has stronger and distantly spaced, concentric, raised lines. Subgenus Lucinoma Dall 1901 Fhacotdes filosus Stimpson Northeast Lucina Plate 38); figure 78a Newfoundland to north Florida and the Gulf States. 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 Figure 28f Alaska to southern California. 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 Plate 38f North Carolina to Florida, the Gulf States and West Indies. 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 Plate 386 North Carolina to east Florida, Cuba and Bermuda.