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NO. 12 PERMIAN BRACHIOPODS FROM OREGON——COOPER T7 
S. pyramidata (Tschernyschew) which occurs in the Russian “Schwa- 
gerina”’ beds. 
Rostranteris is a little-known terebratuloid genus described from 
Sicily where it is said to be Word in age (Miller, 1933). The Oregon 
species, R. merriami Cooper, n. sp., is most like Rhynchonella keyser- 
lingt Moeller from the “Schwagerina” beds of Russia. The other 
Oregon species, R. sulcatum Cooper, n. sp., is most like R. nucleola 
(Kutorga) also from the “Schwagerina” beds but identified widely 
in other formations throughout the world. 
Of the three species of Dielasma described from the Oregon fauna, 
D.? truncatum Cooper, n. sp., is eliminated from consideration be- 
cause of the uncertainty of its stratigraphic position. The other two 
species, both new, are not very distinctive. Dielasma breviplicatum 
Cooper, n. sp., is most like D. prolongatum Girty from the Delaware 
Mountain formation. 
CORRELATION OF THE OREGON FAUNA WITH PERMIAN FAUNAS 
OF NORTH AMERICA 
It is difficult to correlate Permian faunas on the basis of brachio- 
pods because little is known about them. In North America only 
three studies are available for consultation: Girty’s (1909) report 
on the Guadalupian fauna of west Texas, which, although massive, 
is incomplete; King’s (1930) report on the Glass Mountains, Texas, 
brachiopods; and Dunbar and Condra (1932) on the Pennsylvanian 
brachiopods of Nebraska. The title of the last monograph is mis- 
leading because the report contains descriptions of many Lower 
Permian species. 
Inspection of the Oregon fauna will at once show its Middle 
Permian affinities. It is therefore unnecessary to consider Wolf- 
campian or the higher Guadalupian. In comparing with the Glass 
Mountains sequence, in which the brachiopods are perhaps better 
known than in any other fauna, it is necessary to make an explana- 
tion of the Leonard and Word formations. 
Glass Mountains—The Leonard fauna is a varied one. The as- 
semblage at the base and for some hundreds of feet is characterized 
by Scacchinella and is quite different from the fauna found in the 
upper part. The fauna of the Leonard described by King in 1930 
is characterized by a number of genera which, in the Glass Mountains, 
are confined to this interval: Jnstitella and Uncinuloides. In the 
eastern part of the mountains the Word formation overlying the 
Leonard is distinguished by the bituminous and laminated nature of 
