604 Karl A. Grönwall. 



cimens 19 — 22 mm. in width, and can liere be compared with our 

 figures, PI. XXIX, Fig. 11—13, and Stuckenberg's figures, 1875, PI. 

 I, Figs. 5, 6, 7. 



In this review we have brought forward reasons in support of the 

 theory a) that Prodiictus timanicus Stuck., which occurs in the Upper 

 Carboniferous formations of Arctic North America, and which, in 

 Spitzbergen, is an exceedingly common species, and which is also 

 found in great numbers in the Timan tundra of northern Russia, is 

 probably a representative species, as is Pr. inflatas M. Chesn., and 

 b) that thereby we have proved for the fauna of our formations in 

 North-east Greenland analogies with homotaxial formations in the 

 Arctic regions both to the east and the west. Still, the agreement 

 between the brachiopod fauna of the Upper Carboniferous deposits of 

 North-east Greenland and the corresponding faunas in Russia, on 

 Spitzbergen and Beeren Eiland is — as will be developed in our 

 next section — a very close one, and, in respect to the number of 

 species in North-east Greenland, very complete, while in consequence 

 of our scanty knowledge of the formations in the regions last 

 mentioned, the connection with the Upper Carboniferous of Arctic 

 North America can hardly be said to be more than indications. 



