NO. 12 PERMIAN BRACHIOPODS FROM OREGON——COOPER 49 
the dorsal umbo. Umbonal region narrowly convex and with steep, 
almost vertical slopes to the cardinal extremities. Median region 
somewhat inflated ; lateral slopes and anterior slope very steep to the 
margins. Cardinal extremities auriculate, ears small, forming an ob- 
tuse angle (118°). Median portion of valve slightly depressed by an 
almost imperceptible sulcus which may or may not reach the anterior 
margin. 
Brachial valve trapezoidal in outline, moderately concave with the 
deepest part located just anterior to the umbo. In front of this deep 
part a barely perceptible fold extends anteriorly to the front margin. 
Areas extending obliquely to anterolateral extremities and bounding 
the fold moderately deep. Cardinal extremities deflected in a dorsal 
direction, flattened ; marginal parts of valve forming a well bounding 
the concave portion. 
Measurements in mm.—Holotype, length 27.8, width 30.4, thick- 
ness at middle 12.2, height 15.7, length of brachial valve 21.8, surface 
measure 50; paratype, U.S.N.M. 125357, length 25, width 25.5, 
thickness at middle 9, height 12.8, length of brachial valve 20.9; 
paratype, U.S.N.M. 125358, length 22.5, width 23.9, thickness at 
middle 8.8, height 11.3, surface length 36, length of brachial valve 
18.7; paratype, U.S.N.M. 125454 (brachial valve), length 21.2, mid- 
width 32.2, hinge width 20.7, surface length 37. 
Types.—Holotype, U.S.N.M. 125551; figured paratypes, U.S.N.M. 
125356, 125357, 125359, 125454; unfigured paratype, U.S.N.M. 
125358. 
Localities —636, 638, 639; F ; Pio, P11; S25, S29, S39, S4o, S45, 
S46, S47, S50, S70, S87; U.O. 2201, 2201-1, 2202, 2204-1, 2204-3. 
Discussion.—This species is most suggestive of Echinoconchus fas- 
ciatus (Kutorga) of described European Permian species. It differs, 
however, in having different dimensions, the Oregon species being 
shorter and wider with a broader anterior and more flaring sides. 
Echinoconchus inexpectatus, new species, is a fairly common spe- 
cies in the Oregon Permian and is usually found in dense, hard, 
brownish-gray limestone having a very fine grain. 
Suborder RHYNCHONELLOIDEA Moore, 1952 
Superfamily RHYNCHONELLACEA Schuchert, 1896 
Family CAMAROTOECHIIDAE Schuchert and LeVene, 1929 
WELLERELLA MULTIPLICATA Cooper, new species 
Plate 10B, figures 7-11 
Shell of about medium size for the genus, subtriangular in outline; 
wider than long and with the greatest width at about the middle; sides 
