726 J. W. BEEDE 
confined to the rocks below Series IV. Chonetes granulifer has a 
similar range in the Uralian deposits, but begins in the Allen lime- 
stone and continues into the Florence flint in the Kansas rocks. 
Spirifer cameratus, Spiriferina kentuckiensis, and Hustedia mormont 
or a near relative of it are found as high as the Schwagerina lime- 
stone, and two of them, or their near allies, occur throughout the 
Artinskian and Permian in Russia. In the Kansas succession Spiri- 
ferina reaches the Elmdale formation, and the other two the Neva 
limestone. Two of them range through the whole Salt Range deposits. 
Cry ptacanthia compacta or a species almost identical with it ranges 
through the Russian deposits into the Artinsk, and is confined to 
Series I and II of our section. Cleiothysis has a similar range in 
Europe, throughout the Permian in Asia, and to the Fort Riley 
limestone in the Mississippi Valley region. Shells of types of Pro- 
ductus boliviensis and P. lineatus are associated with the rocks from 
the Allen to the Oread limestone. Their Russian range is from the 
Cora to the Artinsk inclusive. Productus cora, in the strict sense, is 
probably confined to the rocks below the Deer Creek limestone, and 
those above are referable to Norwood’s P. prattenit which continues 
to the Permian. In Europe P. cora ranges into the Artinsk. Pro- 
ductus gruenwaldti and P. punctatus range through the Artinsk, 
and are unknown above the Howard limestone of our section. Pro- 
ductus nebraskensis is quite as abundant in Series IV as at any horizon 
below, while (as understood by Tschernyschew) it is confined to 
the Omphalotrochus horizon.' However, its near relative ranges 
through the Artinsk. Dielasma bovidens occurs up to the base of 
the Wreford limestone and through the Schwagerina limestone of 
the Urals. The species of Squamularia are hard to differentiate 
and, with their allies, are ubiquitous throughout Eurasian Anthra- 
colithic rocks. They are unknown above the Howard limestone. 
«In the original description this species was supposed to be a sharp-beaked form. 
On the contrary it is an attached form, in its early stages presenting nearly every charac- 
teristic of a true Strophalosia, except that the adductor scars are arborescent. Mr. 
Greene, who is working on this species, has not yet completed his studies and it cannot 
be stated yet whether this character is a case of parallel development, or whether this 
is a species of Productus which has taken on the habit of attachment in its young stage. 
If the latter be true, it is the only case of an attached Productus with which I happen 
to be acquainted. 
