NWO; EZ PERMIAN BRACHIOPODS FROM OREGON—COOPER 
(26) Ventral view of a specimen showing two of the large steadying 
spines on the trail, X 1, paratype, U.S.N.M. 125370a. Locality S43. 
D. Linoproductus cf. L. lutkewitschi (Stepanow) .........-+eereseeeters 
(27-29) Respectively side, posterior, and dorsal views of an imperfect 
specimen with margin restored, 1, figured hypotype, U.S.N.M. 
125326. Locality S14. 
PLATE 7 
A. Probolionia posteroreticulata Cooper, new SPeCi€S........ cess cece ee ees 
(1-3) Respectively side, posterior, and ventral views of a pedicle valve, 
<I, paratype, U.S.N.M. 125366b; (7-9) respectively posterior, 
ventral, and side views of another pedicle valve, paratype, U.S.N.M. 
125366a; (10-12) posterior, side, and ventral views of the preceding 
paratype, X 2, partially exfoliated and showing impression of cincture 
on interior of pedicle valve; (17) fragmentary pedicle valve showing 
one of the lobes of the brachial ridges, X 2, paratype, U.S.N.M. 
125366d; (18) anterior view of same paratype, X 2, showing steep, 
endospinose trail and anterior edge of diaphragm; (19) interior of 
a silicified but imperfect pedicle valve showing the elevated adductor 
ridge, 2, paratype, U.S.N.M. 125366j; (20) specimen with part 
of the pedicle valve broken away to show the position of the brachial 
valve, the depth of the visceral cavity, and the diaphragm, X 2, 
paratype, U.S.N.M. 125366c; (21) posterior of an exfoliated pedicle 
valve showing a cardinal process etched into relief by acid, X 4, 
paratype, U.S.N.M. 125366f; (22) polished transverse section show- 
ing diaphragm and successive trails of the brachial valve, 2, para- 
type, U.S.N.M. 125366e. Locality S103. 
(4-6) Respectively ventral, side, and posterior views of a large pedicle 
valve, 1, paratype, U.S.N.M. 125367. Locality S87. 
(13-15) Respectively posterior, ventral, and side views of a large and 
well-preserved pedicle valve, X 2, holotype, U.S.N.M. 125369. Local- 
ity S4o. 
(16) Dorsal view of a specimen showing the brachial valve but with 
the trail broken along the diaphragm, X1, paratype, U.S.N.M. 
125374. Locality 638. 
(23) Impression of the exterior of a brachial valve showing the long 
diaphragm around the visceral disk, I, paratype, U.S.N.M. 125550. 
Locality U.O. 2202-2. 
B. Marginifera? brevisulcata Cooper, new SPECIES. ......- + se eee e eee eee 
(24-26) Respectively ventral (with margin restored), posterior, and 
side views of an exfoliated specimen, X1, paratype, U.S.N.M. 
125362. Locality S4o. 
(27-29) Respectively posterior, side, and ventral views of the holotype, 
U.S.N.M. 125363a. Locality S3o. 
C. Pleurohorridonia? elongata Cooper, new SPeCieS.........eeeeeeeeeeees 
(30-33) Respectively posterior, anterior, ventral, and side views, X I, 
of the holotype, U.S.N.M. 125346. Locality S51. 
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