CLASS PELECYPODA 
89 
Pandora glacialis Leach, 1819. 
Plate 15, fig. 11, and plate 42, figs. 3, 4. 
Jour. Phys., 88, p. 465. Sowerby, Spec. Conch.; figs. 4-6. 
Shell broad, rather short, ventricose, rather thick, wrinkled concen¬ 
trically, anterior side with a very slight corner, impressed with a slightly 
radiating groove, situated at the margin; posterior side broader, very 
shortly beaked, obtuse, rayed near the margin with two rather nodulous 
ribs, convex at the ventral margin; left valve deep, without teeth; right 
valve with one tooth; cartilage inserted in a pit; thickened at the sides 
with a calcareous layer. (Conch. Iconica.) 
Type in British Museum? Type locality, Spitzbergen. 
Range. Arctic Ocean to Juan de Fuca Strait. Also Atlantic. 
Pandora glacialis eutaenia Dali, 1915. 
Proc. U. S. N. M., 49:449. 
This variety, with a more rostrate posterior end and averaging larger 
than the typical form, was obtained at Port Etches and eastward at Sitka. 
(Dali.) 
Type in U. S. N. M., No. 171062. Type locality, Port Etches, Alaska. 
Range. Port Etches to Sitka, Alaska. 
Pandora bilirata Conrad, 1855. 
Plate 53, figs. 8, 9. 
Proc. Acad. Nat. Sci. Phila ., 7 :267. Pacific R. R . Reps., 6; pi. 5, fig. 25. 
Oblong, very inequilateral, contracted anteriorly, convex medially; 
posterior side with two distant, carinated lines toward the hinge margin 
which is straight and not oblique; posterior extremity truncated. Length, 
15 ; height, 6 mm. (Conrad.) 
Type in Acad. Nat. Sci. Phila.? Type locality, California. 
Range. Forrester Island, Alaska, to Point Abreojos, Lower Cali¬ 
fornia. 
Pandora granulata Dali, 1915. 
Proc. U. S. N. M., 49:449. 
Shell closely resembling in form the bilirata , but much smaller, more 
translucent and of a greenish tint, with the base and dorsal margins more 
nearly parallel and with the elevated line of the posterior dorsal surface 
delicately granulated. Length, 8.5; height, 4; diameter, 1; beaks behind 
the anterior end, 1 mm. (Dali.) 
Type in U. S. N. M., No. 211348. Type locality near La Paz, Lower 
California. 
Range. Santa Barbara, California, to the Gulf of California. 
