CLASS PELECYPODA 
207 
Panomya beringiana Dali, 1916. 
Proc. U. S. N. M. y 52:416. 
Shell resembling P. artica Lamarck in a general way, but thinner, less 
■cylindrical, much larger, and proportionately shorter. Length, 130; height, 
80; diameter, 50 mm. (Dali.) 
Type in U. S. N. M., No. 212875. Type locality, Station 3529, near 
Pribiloff Islands, in 56 fathoms. 
Range. Eastern Bering Sea. 
Panomya ampla Dali, 1898. 
Plate 10, fig. 3. 
Trans. Wagner hist. Sci. f 3, pt. 4:883. Proc. U. S. N. M., 24:560; pi. 40, figs. 3, 4. 
This differs from P . norvegica by its more heavy and rude shell, with 
a more expanded posterior region and flatter, more irregular valves. The 
shell is chalky white with a black, dehiscent, tarry periostracum, which is 
rarely preserved even in the living animal, which the valves only partially 
cover. (Dali.) 
Type in U. S. N. M., No. 151221. Type locality, Aleutian region. 
Range. Aleutian region to Puget Sound. In the Pleistocene of the 
North Pacific, Bering and Okhotsk seas. 
Genus SAXICAVELLA Martens, 1885. 
Shell equivalve, inequilateral, flaring, oval, transverse or sub-trape¬ 
zoidal, obliquely angular in the rear; hinge becoming edentate or showing 
on the right valve, cardinal tooth, fitting into corresponding cavity in 
left valve; ligament short, prominent, pallial line gently sinuous, sinus very 
wide, not deep. 
Type. My a plicata Montagu. 
Distribution. Europe and west coast of North America. 
Saxicavella pacifica Dali, 1916. 
Proc. U. S. N. M., 52:466. 
Shell small, thin, white, with a pale olive, dehiscent, periostracum; 
inequilateral, the anterior end shorter and more attenuated, the posterior 
longer, more vertically expanded; surface sculptured only by incremental 
lines; a rounded ridge extends from the inconspicuous beak to the posterior 
basal margin, but there is no keel or angle; interior distinctly pearly, hinge 
as in the Atlantic species. Length, 5.8; height, 3 ; diameter, 2 mm. (Dali.) 
Type in U. S. N. M., No. 209912. Type locality, Station 4356, off 
Point Loma, San Diego County, California, in 131 fathoms. 
Range. Known only from the type locality. 
