104 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Type locality and disposition of the type not known to the present 
writer. 
Range. Catalina Island, California, to Panama Bay. Also Japan and 
the Antilles. 
Family ASTARTID2E. 
Genus ASTARTE Sowerby, 1816. 
Shell equivalve, inequilateral, sub-ovate, or orbicular, or sub-trigonal, 
generally sub-compressed; concentrically wrinkled, covered with a thick 
epidermis, closed. Muscular impressions two, large, rather kidney-shaped. 
Impression of the mantle entire. Hinge tridentate in each valve. Liga¬ 
ment external, with dorsal area and lunule excavated. (Reeve.) 
Type. Pec tunc ulus sulcatus Da Costa. 
Distribution. Bering Strait, Wellington Channel, Kara Sea, 
Ochotsk, Puget Sound, Oregon, Norway, Britain, Canaries, yEgean. 
Range in time. From the Carboniferous in North and South Amer¬ 
ica, Thibet and Europe. 
Astarte polaris Dali, 1903. 
Pros. U. S. N. M., 26:939; pi. 63, fig. 5. 
Shell rounded-trigonal, moderately thick, bluish white, covered with a 
slightly polished light-brown periostracum; valves moderately convex, 
with the umbos high, somewhat prosogyrate, over ia well-impressed 
lanceolate lunule, which is unequally divided, the right valve bearing the 
larger share; escutcheon narrower and longer than the lunule, impressed, 
smooth; sculpture of forty or more small, narrow, regular, concentric 
riblets separated by about equal interspaces; in the adult the posterior 
slope and ventral third of the disk have the riblets replaced by somewhat 
uneven concentric striation; interior smooth, the inner margins finely 
evenly crenate; hinge rather solid, the middle cardinal in each valve 
grooved or bifid. Length, 28; height, 25; diameter, 15 mm. (Dali.) 
Type in U. S. N. M., No. 106859. Type locality, near Shumagin 
Islands, Alaska. 
Range. Aleutian and Shumagin Islands, Alaska, and Circumboreal. 
Astarte compacta Carpenter, 1864 
Plate 2, fig 4. 
Sup pi. Rep. Brit. Assoc., 1864, p. 642. Proc. Acad. Nat. Set. Phila., 1865, p 57 Proc 
U. S. N. M., 26:944; pi. 63, fig. 8. 
A. t. “A compress^ 9 simili, sed compacta, minus transversa; liris 
concentricis expressis, paucioribus, marginem posticam versus obsoletis; 
