158 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
been obliged to grow into an abnormally swollen and tumid shape. They 
are usualy chalky and of a gray tint. (Dali.) 
Type locality, not given. 
Range. Kodiak Island, Alaska, to San Diego, California. 
Paphia staminea spatiosa Dali, 1916. 
Plate 9, fig. 1. 
Proc. U. S. N. M., 52:413. 
Shell large, heavy, rounded quadrate, inequilateral, the beaks behind 
the anterior end 18 mm.; yellowish or brownish white without markings; 
sculpture of simple, similar, narrow radial ribs with narrower interspaces, 
except on the posterior dorsal area where there are a few wider ribs with 
deeper interspaces; inner margins finely crenulate; pallial sinus deep, 
narrow, nearly horizontal. Length, 80; height, 67; diameter, 50 mm. 
(Dali.) 
Type in U. S. N. M., No. 151562. Type locality, Coos Bay, Oregon. 
Range. Puget Sound to Anaheim Bay, California. 
Genus LIOCYMA Dali, 1870. 
Shell trigonal or elongate-ovate, small, thin, smooth; furnished with 
concentric undulations and occasionally fine radiating lines; provided with 
a polished epidermis; pallial sinus small, rounded triangular; hinge teeth 
three in each valve, divaricate; middle tooth largest, grooved on the upper 
edge. Lunule faint, no areola ligament set in below the exterior surface. 
(Dali.) 
Type. Venus fluctuosa Gould. 
Distribution. From Japan and eastern Siberia to British Columbia. 
Liocyma beckii Dali, 1870. 
Proc. Boston Soc. Nat. Hist., 13:257. Arner. Jour. Conch., 7; pi. 14, fig. 7. 
Distinguished by its rounded umbones and moderate tumidity, by the 
angulated hinge margin, short, anterior extremity, less arcuated ventral 
margin and small size. The area occupied by the hinge teeth is shorter 
and wider than in L. fluctuosa, from which its trigonal shape immediately 
distinguishes it. Over one hundred specimens were collected at Plover 
Bay, E. Siberia, agreeing with each other and differing from young of 
L. fluctuosa. The pallial line is very broad. Lat. 0.4; long. 0.56; alt. 
0.54 poll. (Dali.) 
Type in U. S. N. M. Type locality, Plover Bay, E. Siberia. 
Range. Arctic Ocean, Bering Sea. Also Japan. 
