172 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
dent with the whole of the pallial line below. Length, 86; height, 56; 
diameter, 20 mm. (Dali.) 
Type in U. S. N. M. Type locality, Pleistocene of San Diego, Cali¬ 
fornia. 
Range. Living in Puget Sound. In the Pleistocene at San Pedro and 
San Diego, California. 
Macoma inquinata Deshayes, 1854. 
Plate 45, figs. 2a, 2b, 3a, 3b. 
Proc. Zool. Soc., p. 357. Conch. I conic a, Tellina; pi. 30, fig. 164. 
Shell ovate, compressed, solid, pale fulvous, subequilateral, smooth or 
irregularly striated; posterior side somewhat wedge-shaped, subrostrated, 
dorsal margin depressed, sloping, end truncated, radiating angle obtuse, 
flexure not conspicuous; anterior side rather rounded, dorsal margin slop¬ 
ing, umbones acuminated, ligament large, prominent. (Conch. Iconica.) 
Type in Museum Taylor. Type locality, Vancouver Island, British 
Columbia. 
Range. Bering Sea to Monterey, California. Also Japan. In the 
Pleistocene at Monterey and San Diego, California; Pliocene at Twelve 
Mile House and San Fernando, California. 
Macoma inquinata amheimi Dali, 1916. 
Plate 42, fig. 9. 
Proc. U. S. N. M., 52:414. 
Shell resembling the typical inquinata but shorter, and relatively more 
plump; the beaks 15 mm. behind the anterior end; the basal margin some¬ 
what produced; the rostration shorter, less pronounced and less obliquely 
twisted. Length, 38; height, 30; diameter, 15 mm. (Dali.) 
Type in U. S. N. M., No. 122537. Type locality, Kodiak Island, 
Alaska. 
Range. Kodiak Island, Alaska, to San Francisco, California. 
Macoma balthica Linnaeus, 1758. 
Plate 44, figs. 1, 2, 9. 
Syst. Nat., ed. 10, p. 677. Thes. Conch., Tellina; pi. 50, fig. 121. 
Shell rather round, thick, somewhat ventricose, pale rose or white, 
with a thin epidermis equivalve, dorsal margin arched, sloping, ventral 
margin slightly excavated near the umbones. Length, 27; height, 22; 
diameter 11 mm. (Conch. Iconica.) 
Type locality, Baltic Sea. 
Range. Point Barrow, Arctic Ocean, to San Diego, California. Also 
Japan. Circumboreal. 
