NO. 12 PERMIAN BRACHIOPODS FROM OREGON—COOPER 33 
KROTOVIA PARVA Cooper, new species 
Plate 2B, figures 5-12 
Shell small, about one-third wider than long; lateral margins nar- 
rowly rounded, anterior margin broadly rounded ; cardinal extremities 
nearly a right angle. Surface covered by small, fairly densely crowded 
spines that arise from short, low pustules. 
Pedicle valve strongly convex in lateral profile with the greatest 
convexity at about the middle; anterior profile strongly convex in 
the midregion but with the sides inclined. Beak strongly incurved 
over the hinge; umbo narrow, swollen, and with steep slopes to the 
hinge and cardinal extremities. Midregion of valve swollen, with 
steep lateral slopes but the anterior slope somewhat less steep. 
Brachial valve concave with the deepest part in the median region 
and posterior to the umbonal region. Cardinal extremities slightly 
flattened. 
Measurements in mm.—Holotype, length 10.9, surface length 11, 
width at middle 14.5, hinge width 12.0, height 5.6?; paratype, U.S. 
N.M. 125355b (brachial valve), length 88, midwidth 12.6, hinge 
width 11.8. 
Types.—Holotype (pedicle valve), U.S.N.M. 125355a; figured 
paratype, U.S.N.M. 125465; unfigured paratype (impression of bra- 
chial exterior), U.S.N.M. 125355b. 
Localities —P10; S4o. 
Discussion.—This species is characterized by its small size, trans- 
verse outline, and numerous fine spines. Its transverse form and 
numerous spines distinguish it from K. barengi (Miloradovitch) from 
Russia and Greenland. No American species is like it in size or 
ornamentation. It differs from K. pustulata young in its finer spines, 
This species is also suggestive of K. nielsoni Dunbar, but the Green- 
land species, although nearly of the same size as the Oregon species, 
is a much rounder form in outline and thus much less transverse. 
KROTOVIA PUSTULATA (Keyserling) 
Plate 8A, figures 1-5 
Productus pustulata Keyserling, TscHERNYSCHEW, Mém. Com. Géol., St. Peters- 
burg, vol. 16, No. 2, p. 617, pl. 30, figs. 1,2; pl. 53, figs. 5,6, 1902. 
Krotovia pustulata (Keyserling) Branson, Geol. Soc. Amer. Mem. 26, p. 379, 
1948. 
This species can be recognized by its large size and the peculiar 
arrangement of the spines on the surface. The shell is transversely 
subrectangular in outline with a moderately convex pedicle valve 
