30 Annals of the Carnegie Museum. 



are equivalent to the five upper zones of Dr. Wedekind's classification, 

 and two lower zones, which are equivalent to the Manticoceras zone. 



This sixfold division is not widely applicable and therefore is of 

 little assistance in correlation with the American Upper Devonian 

 formations, where the brachiopod fauna is much more abundant than 

 the cephalopod fauna. 



Apparently the cephalopods are the only abundant fossils in the 

 German Upper Devonian, and for that reason the brachiopods are 

 not mentioned. It is therefore possible to make a much closer cor- 

 relation between the Upper Devonian of the Ural Mountains and 

 North America, than between that of Germany and North America. 

 From an examination of the brief lists of fossils, noted in connection with 

 Tschernyschew's two zones of the Upper Devonian, it is evident that 

 the upper zone, D', is approximately equivalent to the Three Forks 

 Formation, exclusive of members i and 2, and contains many similar 

 fossils, although ohly a few of the species are the same. This corre- 

 lation and also the other European correlations place the Three Forks 

 fauna above the Manticoceras fauna, and make it the latest Devonian 

 fauna of which we have any record in North America, which is the 

 conclusion at which Dr. Raymond^^ arrived some years ago, before 

 these recent European correlations were made. 



Description of the Brachiopoda. 



Class BRACHIOPODA. 



Order ATREMATA Beecher. 



Superfamily LINGULACEA Waagon. 



Family LI NGULID^ Gray. 



Genus Lingula Bruguiere. 



I. Lingula hubbardi sp. nov. (PI. VII, fig. i.) 



Description. — Shell elliptical, width about three-quarters the length; 



base regularly rounded; sides gently curving; apex obtuse, with an 



angle of about 115°. The shell has a narrow flattened border about 



one millimeter wide. The surface is marked by fine concentric striae, 



also by fine radiating stride on the middle portion. These stria? are 



somewhat wavy about two-thirds of the way from the apex to the 



margin. The substance of the shell is thin, glistening, brownish black, 



21 Raymond, Proc. 7th Intcrnat. Zool. Cong., Camb., Mass., 1910. 



