NO. 12 PERMIAN BRACHIOPODS FROM OREGON—COOPER 15 
collections of the National Museum are that it ranges through much 
of the Pennsylvanian and into the Permian. The Oregon specimens 
are related to A. hessensis (King) from the upper Leonard of the 
Glass Mountains. 
A number of Oregon specimens are referred to two species of 
Alexenia, a genus described in Russia. This genus embraces shells 
like the familiar “Marginifera” lasallensis of the American Pennsyl- 
vanian and Permian. The generic assignment is not entirely a happy 
one because the interior of the American shells does not agree well 
with the published diagram of the interior of the type species. Never- 
theless, the American shells are long ranged and seem to embrace 
the Oregon specimens. The genus in America goes to lower Word. 
The Oregon specimens are not especially distinctive. 
Two species of Kochiproductus are recognized in the Oregon 
fauna, one of them new but the other assigned to the Russian species 
K. porrectus (Kutorga) from the Cora and “Schwagerina’ beds of 
Timan and the Urals. This genus in North America is common in 
the Wolfcampian but is rare above. A species occurs in the Bone 
Spring formation but it is not yet known from the Word or higher 
beds. In Greenland, however, Kochiproductus occurs in the late Per- 
mian. It does not therefore give definitive aid in correlation but it 
is definitely in the “Schwagerina”’ beds of Tschernyschew. 
For correlation one of the best species in the Oregon fauna is 
Muirwoodia transversa Cooper, n. sp. In North America this genus 
is not known below the Word formation. It appears in the Lower 
Word in great abundance and is common in a larger form in the 
Phosphoria formation and its equivalents in Nevada, Utah, Wyoming, 
and Mexico. The genus is also known in Greenland. In Russia, 
however, it may have a longer range than in North America. It is 
recorded there from the “Schwagerina” horizon and is known from 
the Jisu Honguer limestone in Mongolia and elsewhere in China. 
At one time Waagenoconcha was regarded as an excellent guide to 
the Permian, but now it is known from the Pennsylvanian of this 
country and occurs in pre-Permian rocks in Russia. The Oregon 
species is a small one but is like small individuals of W. montpelier- 
ensis Girty. 
Krotovia is represented by three species, one of them new. Of the 
previously described species, K. aff. K. barenzi is from the “Schwa- 
gerina’ beds in Russia and from the Upper Marine group in northeast 
Greenland. Krotovia pustulata (Keyserling) is from the “Schwa- 
gerina”’ beds of Russia and the Maping limestone of China. In North 
America no other described Permian productoid like this one is known. 
