42 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Glycymeris subobsoleta Carpenter, 1864. 
v^Plate 40, figs. 8, 9. 
Suppl. Rep. Brit. Assoc., p. 644; Ann. Mag. Nat. Hist. (ser. 3), 14:425. 
A. testa A. septentrionali simili, parum inaequilaterali, haud tumida; 
umbonibus obtusis, latis, satis prominentibus; cinerea, rufo-castaneo varie 
picta; epidermide copiosa, sublaminata; marginibus ventrali et postico 
valde rotundatis, antico parum producto, dorsali recto; sulcis radiantibus 
subobsoletis sculpta, dorsaliter saepe evanidis; intus marginibus ventrali 
valde, ant. et post, parum crenatis; lamina cardinis subangulata; dentibus 
paucioribus, validid, angustatis; cicatr. add. antica castanea, callosa; 
ligamento sulcato. Long., .13; lat., .12; alt., .7. (Carpenter.) 
Shell similar to G. septentrionalis, slightly inequilateral, not tumid, 
umbones obtuse, broad, quite prominent; ash-colored, variegated with 
reddish chestnut; epidermis thick, somewhat laminated; ventral and pos¬ 
terior margins quite rounded, anterior margin produced, dorsal straight, 
sculptured by subobsolete radiating grooves, often disappearing dorsally; 
ventral margin strongly, and anterior and posterior internal margins 
slightly crenulated; cardinal plate subangular, with a few strong, com¬ 
pressed teeth; adductor scar chestnut colored; ligament furrowed. 
Type in U. S. N. M. Type locality, Neah Bay, Washington. 
Range. Aleutian Islands, Alaska, to Cortez Bank, California. 
Glycymeris corteziana Dali, 1916. 
Plate 3, fig. 7. 
Proc. U. S. N. M„ 52:402. 
Shell solid, white, with a brownish periostracum, the surface finely 
concentrically sculptured, with less conspicuous fine radiating striie, on 
which the periostracum exhibits ciliated lines; valves moderately com¬ 
pressed, suborbicular, evenly rounded in front and below, somewhat pro¬ 
duced behind, the lower margins finely crenulated; beaks small incon¬ 
spicuous ; area very narrow, closely divaricately grooved; hinge plate 
broad, with about 12 anterior and 16 posterior teeth. Length, 22; height, 
20; diameter, 11 mm. (Dali.) 
Type in U. S. N. M., No. 212431. Type locality, Station 2918, on 
edge of Cortez Bank, California. 
Range. Forrester Island, Alaska, to Cortez Bank, California. 
Glycymeris migueliana Dali, 1916. 
Proc. U. S. N. M., 52:402. 
Shell solid, white, with sparse zigzag lines of reddish brown and 
internally often with a touch of brown near the posterior margin; surface 
smooth except for irregularities of growth; valves suborbicular, anterior 
side slightly longer, posterior hardly produced; beaks low, area small and 
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