TELLINIDAE 421 



pointed and slightly uplifted. Interior blushed with mottlings of chestnut 

 to purplish brown. 



Rupellaria carditoides Conrad Hearty Rupellaria 



Vancouver, B.C., to Lower California. 



1 to 2 inches in length. Very variable in shape, usually oblong; in some, 

 squat and almost orbicular. Shell white to grayish white and very chalky in 

 texture. Concentric growth lines quite coarse and irregular. Radial sculpture 

 of pecuhar, fine, scratched lines crowded together, but worn away in some 

 specimens. Fairly common. Found boring into hard rock. Nepionic shell 

 usually oblong. R. californica Conrad is the same. 



Subfamily COOPERELLINAE 

 Genus Cooperella Carpenter 1864 



Hinge plate narrow, with 2 right and 3 left short, divaricating cardinals 

 under the beaks. The left central cardinal is always, and the others com- 

 monly, split or bifid. No laterals. Muscle scars small and oval. Pallial line 

 narrow, the sinus long. 



Cooperella subdiaphana Carpenter Shiny Cooper's Clam 



Southern California to Lower California. 



About % inch in length, oval-oblong, opaque-white with a brilliant gloss 

 and slight opalescence. Fragile. Outer surface with slightly wavy concentric 

 growth lines. Ligament tiny, short, set just behind the beaks and visible ex- 

 ternally. Moderately common offshore to 40 fathoms. 



Superfamily TELLINACEA 



Family TELLINIDAE 



Genus Tellina Linne 1758 



Subgenus Tellina s. str. 



Tellina radiata Linne Sunrise Tellin 



Plate 4oe 



South Carolina to south half of Florida and the West Indies. 



2 to 4 inches in length, elongate, moderately inflated. Characterized by 

 its oily smooth, glistening surface and rich display of colors — either creamy- 

 white or rayed with pale-red or yellow. Interior flushed with yellow. The 

 beaks are usually tipped with bright-red. Uncommon in Florida but abundant 

 in the West Indies. 



