tue N@uTILuUs. 
Vol. Ix. APRIL, 1896. No. 12 
NEW AMERICAN UNIONIDE. 
BY BERLIN H. WRIGHT, PENN YAN, N. Y. 
Unio bursa-pastoris sp. nov. PI. III, figs. above and below. 
Shell rough, disposed to be both nodulose and pitted, very inequi- 
lateral, rounded evenly in front, umbonial ridge nearly obsolete, 
dorsal margin arcuate, ligament long, thick and much elevated, 
epidermis reddish-black, rayless, except when very young; sub- 
stance of shell thick ; cavity of shell shallow and uneven, with a 
wide flattened area extending from beak cavities to the posterior 
angle ; cavity of the beaks very deep, compressed and very wide; 
pallial impression very rough and deep ; greatest diameter of shell 
over the anterior edge of the cardinals; cardinal teeth low, thick 
and rather smooth ; lateral teeth short, thick and widely separated 
from the cardinals; dorsal plate long, wide and usually notched 
near the cardinals. Terminal cicatrices distinct ; dorsal cicatrices 
numerous, shallow and under the posterior cardinal. Nacre white 
and usually much blotched with smoky spots; occasionally with a 
shade of pink in the center of the cavity. 
Size, length 2°5 inches, width 3°6, diameter 1°25. 
Hab. Powell River, Virginia. 
My Cabinet, National Museum and Mus. Acad. Nat. Sci., Phila. 
Remarks.—This species belongs to the group of which U. argen- 
teus Lea is typical. It differs from that species in having a darker 
