NO. 12 PERMIAN BRACHIOPODS FROM OREGON—COOPER 
PLATE 12 
A. Rostranteris sulcatum Cooper, new SPpeCieS...........cecereeeceeecece 
(1-5) Respectively posterior, ventral, side, dorsal, and anterior views 
of a complete specimen, XX 2, paratype, U.S.N.M. 125408. Locality 
U.O. 2201-2. 
(6) Dorsal view of the holotype, X 1, U.S.N.M. 125410; (7-11) re- 
spectively ventral, anterior, side, posterior, and dorsal views of the 
holotype, X 2. Locality S4r. 
B. Rostranteris merriami Cooper, new SpeCieS.........-2e ces cecese cece 
(12-16) Respectively anterior, posterior, ventral, side, and dorsal views 
of the holotype, & 2, U.S.N.M. 125409a; (17, 18) side and dorsal 
views of the holotype, 1; (19-23) respectively anterior, ventral, 
dorsal, posterior, and side views of another perfect specimen, X 2, 
paratype, U.S.N.M. 125400b; (24, 25) side and dorsal views of the 
preceding paratype, X 1. Locality Sqr. 
(26) Specimen with brachial valve rubbed away to show loop with its 
long, longitudinal spine, X 4, paratype, U.S.N.M. 125560. Locality 
S50. Specimen photographed under water. 
C. Dielasma rectimarginatum Cooper, NEW SPECIES. ..... 6. cece eee eeeeee 
(27-31) Respectively dorsal, side, anterior, posterior, and ventral views 
of the holotype, U.S.N.M. 125414. Locality U.O. 2201-1. 
D. Dielasma brevicostatum Cooper, new SPeCieS.......... ee ceeseeeeeeeee 
(32-36) Respectively side, posterior, anterior, dorsal, and ventral views, 
<1, of the holotype, U.S.N.M. 125413a; (37-39) respectively side, 
posterior, and dorsal views of a large paratype, 1, U.S.N.M. 
125413b. Locality U.O. 2202-2. 
(40, 41) Anterior and ventral views of a large, exfoliated specimen, 
I, paratype, U.S.N.M. 125415. Locality U.O. 2216-2. 
BS PPUSTPRIG SDy I ccic lemicde 6 oite 5 2.8 clencd Sen maseinecae emcyecia are phe aye eiursiote = ametecars 
(42) Ventral view of an imperfect specimen, X 1, figured specimen, 
U.S.N.M. 127578; (43, 44) side and ventral views of the same speci- 
men, X 2. Locality S25. 
F. Spiriferellina pauciplicata Cooper, new SPeCi€S.....-..eeee eee eeeeeeee 
(45-49) Respectively dorsal, anterior, side, posterior, and ventral 
views, X1, of the poorly preserved holotype, U.S.N.M. 125464. 
Locality S87. 
G. Pseudomartinia berthiaumei Cooper, new SpeCieS.....-.....e eee eeeeee 
(50-54) Respectively ventral, anterior, side, posterior, and dorsal 
views X 1, of the holotype, U.S.N.M. 125395. Locality S12. 
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