64 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
small, on the gaping side acutely pointed. Length, 24; height, 15 ; diame¬ 
ter, 11 mm. (Conrad.) 
Type in Phila. Acad. Sci. ? Type locality, Fayal Island. 
Range. Monterey, California, to Acapulco, Mexico. 
Subgenus Limatula S. Wood, 1839. 
Lima attenuata Dali, 1916. 
Proc. U. S. N. M., 52 :404. 
Shell small, narrow, thin, white, radiately sculptured with low, rather 
close-set, rounded threads, crossed near the distal margin with low con¬ 
centric irregular lamellations so as to give that part of the valve a minutely 
scabrous effect; the medial radii are broader than the others and radially 
striate, no mesial sulcus is noticeable but it is clearly indicated on the 
inside of the valve; beaks low, incurved; area triangular, resilifer large 
and excavated; hinge margin short, strongly buttressed on each side; 
valve margin crenulate. Height, 7; width, 3.6; diameter, 4 mm. (Dali.) 
Type in U. S. N. M., No. 220510. Type locality, Nazan Bay, Atka 
Island, Aleutian chain. 
Range. Southern Bering Sea, the Aleutian Islands, and eastward to 
Shumagin Islands, Alaska. 
Lima subauriculata Montagu, 1808. 
Plate 5, fig. 10. 
Test. British Suppl, p. 63. Jeffreys, Brit. Conch., 5; pi. 25, fig. 3. 
Shell ovate-oblong, pellucid, white, equilateral, equivalve, furnished 
with small, equal, angular projections, or sub-auricles, and wrought with 
numerous longitudinal striae that slightly crenate the margin; along the 
middle are two striae that appear more conspicuous than the rest by being 
opaque, and are equally evident on the inside, a character constant in 
several specimens examined. Length, one-fourth of an inch; breadth, half 
its length. (Montagu.) 
Type in British Museum. Type locality, Great Britain. 
Range. British Columbia to San Quentin Bay, Lower California. 
Also Atlantic. 
Family ANOMIID7E. 
Genus ANOMIA Linnaeus, 1758. 
Shell suborbicular, very variable, translucent, and slightly pearly 
within; attached by a plug passing through a hole or notch in the right 
valve; upper valve convex, smooth, lamellar or striated; interior with a 
sub-marginal cartilage pit, and four muscular impressions, three sub¬ 
central, and one in front of the cartilage; lower valve concave, with a 
