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 



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. 



