174 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
inconspicuous flexure, dorsal margin straight, sloping, end subtruncated, 
ventral margin sloping upward; anterior side oblong, round, subinflated, 
with the upper edge convexly sloping, umbones small, sloping backward, 
ligament elongated, prominent, cardinal teeth small, no lateral teeth. 
(Conch. Iconica.) 
Type in Museum Taylor. Type locality, Iceland or Greenland. 
Range. Arctic Ocean to Monterey, California. Also Japan. Cir- 
cumboreal. In the Pleistocene of Scandinavia, Scotland, Greenland, Si¬ 
beria, and San Pedro, California; Pliocene at San Pedro, California. 
Macoma nasuta Conrad, 1837. 
Plate 45, figs, la, lb, lc, Id. 
Jour. Acad. Nat. Sci. Phila., 7:258. Thes. Conch., Tellina; pi. 64, fig. 224. 
Shell ovate, compressed, smooth but not polished; anterior side dilated; 
posterior side cuneiform, extremity truncated, much above the line of the 
base; fold carinated on the superior valve; beaks central, slightly promi¬ 
nent ; epidermis extremely thin and deciduous, finely wrinkled, brown; 
pallial impression of the left valve joining the anterior cicatrix at its 
lower posterior angle. Length, 1J4; height, 1inches. (Conrad.) 
Type in Phila. Acad. Nat. Sci. Type locality, near San Diego, Cali¬ 
fornia. 
Range. Kodiak Island and Cook Inlet, Alaska, to Scammons La¬ 
goon, Lower California. In the Pleistocene at Santa Barbara, San Diego, 
San Pedro and Ventura; Pliocene at Eagle Prairie and Danget Creek 
in Humboldt County, Santa Rosa, San Fernando, and San Diego; Miocene 
at Sunol, Alameda County, and Foxen’s, Santa Barbara County, California. 
Macoma inflatula Dali, 1897. 
Plate 13, fig. 15, and plate 1, figs. 2, 8. 
Bull. Nat. Hist. Soc. Brit. Col., 2:11; pi. 1, figs. 19, 20. 
Shell small, thin, inflated; full and rounded in front; shorter, com¬ 
pressed and pointed behind, the rostrum strongly bent to the right; sur¬ 
face smooth except for lines of growth, often polished cream color or 
whitish, sometimes pale brown with darker umbones, covered with a 
papery, dehiscent epidermis, which is either gray or greenish; ligament 
short; interior whitish, the pallial sinus reaching before the vertical of 
the beaks, rounded, subequal in the two valves; left with a strong slightly 
bifid anterior, and a simple smaller posterior cardinal tooth; right valve 
with two nearly equal grooved cardinals. Length, 24.5; height, 17.5 ; 
diameter, 8.5 mm. (Dali.) 
Type in U. S. N. M. Type locality, Comox, Vancouver Island, British 
Columbia. 
Range. Arctic Ocean to Ballenas Lagoon, Lower California. 
