58 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
tremely narrow fold. A single specimen is all that has been taken 
from the Oregon Permian. 
NEOSPIRIFER sp. 1 
This genus is represented by fragmentary and crushed specimens, 
not one of them in a condition good enough for description. The 
shells are finely ribbed. 
Types—Mentioned specimens, U.S.N.M. 126984a,b. 
Localities —S1o1, S103; U.O. 2202-2. 
Subfamily MartrnrINAE Waagen, 1883 
PSEUDOMARTINIA BERTHIAUMEI Cooper, new species 
Plate 12G, figures 50-54 
Shell of about medium size for the genus, longer than wide, sides 
gently convex; anterior margin subtruncate. Surface mostly smooth 
but with obscure radial lines on the flanks. 
Pedicle valve moderately convex in lateral profile with the greatest 
curvature in the umbonal region. Beak strongly curved over the 
interarea; delthyrium and interarea visible; interarea short; hinge 
narrow, equal to slightly less than half the shell width. Beak acute; 
umbo somewhat swollen; sulcus originating near the middle but well 
defined only in the anterior third, broad and shallow and occupying 
about half the width at the front. Tongue short, narrowly rounded. 
Flanks steep-sided and gently convex. 
Brachial valve less deep than the pedicle valve, gently convex in 
lateral profile, subcarinate in anterior profile; fold originating at 
about the middle, low, clearly defined in the anterior third only, 
flanks steep-sided and flattened in profile. Umbonal region swollen. 
Measurements in mm.—Holotype, length 22.7, length of brachial 
valve 18.2, width 19.7, thickness 15.8. 
Type—Holotype, U.S.N.M. 125395. 
Localities —S12, S1ot. 
Discussion.—This species is characterized by its elongate-oval out- 
line, the maximum width at about the middle, and the soft contours 
of the fold and sulcus. Pseudomartinia berthiawnei, new species, is 
unlike any described American Permian species. It is differently 
shaped and does not have the elongated anterior and nearly obsolete 
sulcus of P. martinesi Cooper from the Monos formation of Sonora, 
Mexico. It is smaller than, and with completely different outline 
from, Girty’s two species from the Guadalupe Mountains of west 
