98 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Cuspidaria glacialis G. O. Sars, 1878. 
Plate 19, figs. 3, 3a., and Plate 54, figs. 27, 28. 
Moll. Reg. Arct. Norv., p. 45; pi. 6, figs. 8a, 8c. 
Testa magna, modice convexa, forma oblongo-ovato, antice anguste 
rotundata, postice sat producta, rostro longo, horizontali, attenuato, apice 
truncato, margine ventrali medio sat arcuato sub rostro profundius sinuato, 
dorsali medio angulato, antice convexo, postice recto et leviter declivi, 
umbonibus parum prominulis non nihil ante medium sitis. Valvulae solidu- 
lae, albse, semipellucidse, subtiliter concentrice striatas, epidermide cinerea 
tectae, processu cartilaginis valde obliquo et parum prominulo, dente laterali 
v. dextrae elongato, cristaeformi. Long., 23. (G. O. Sars.) 
Type in Museum Christiania. Type locality, Vadso, Norway. 
Range. Off San Diego, California, 239 fathoms. Also Atlantic. 
Cuspidaria subglacialis Dali, 1913. 
Plate 21, fig. 1. 
Proc. U. S. N. M. } 45:593. 
Shell large for the genus, chalky, with a coarse dehiscent olivaceous 
periostracum; equivalve, nearly equilateral. Beaks nearly in the center 
of the shell, anterior dorsal margin arcuately descending, anterior end of 
shell ovately rounded; posterior slope straight, or slightly distally recurved, 
with a short compressed distally gaping rostrum, terminally subtruncate; 
base arcuate, somewhat patulous below and behind the beaks, incurved at 
the beginning of the rostrum ; hinge in the left valve with a small obliquely 
backwardly directed chondrophore; in the right valve there is also a strong 
lamina parallel with the dorsal margin and separated from it by a groove 
which receives the edge of the opposite valve in closing; beaks opistho- 
coelous, inconspicuous. Length, 39; height, 24; diameter, 20 mm. (Dali.) 
Type in U. S. N. M., No. 265904. Type locality, off California coast. 
Range. Off the California coast in deep water. 
Cuspidaria apodema Dali, 1916. 
Proc. U. S. N. M., 52:407. 
Shell small, white, polished, swollen, with a prominent tubular rostrum; 
inequilateral, the beaks 6 mm. behind the anterior end; the rostrum about 
5 mm. long; beaks conspicuous, prosoccelous; the exterior smooth except 
for incremental lines and wrinkles on the dorsal side of the rostrum; 
hinge line nearly straight, anterior and rounding imperceptibly into the 
semi-circular base which is suddenly constricted at the rostrum. Length, 
17; height, 10; diameter, 8 mm. (Dali.) 
Type in U. S. N. M., No. 122602. Type locality, Station 2859, south¬ 
west of Sitka Bay, Alaska. 
Range. Off Sitka, Alaska, to Panama Bay, deep water. 
