REPORT OF THE DIRECTOR I9II 47 



Conularia trentonensis Hall 

 Pterotheca cf. canaliculata (Hall) 

 Eoharpes ottawaensis (Billings) 

 Trinucleus concentricus (Eaton) 

 Proetus undulostriatus (Hall) 

 Triarthrus becki Green 

 Isotelus gigas Dekay 

 Acidaspis trentonensis Hall 

 Calymmene senaria Conrad 

 Pterygometopus callicephaliis (Hall) 

 Ctenobolbina ciliata (Emmons) 

 C. ciliata var. cornuta Ruedemann 

 C. subrotunda Ruedemann 

 Lepidocoleus jamesi (Hall & Whitfield) 

 Turrilepas ? filosus Ruedemann 

 Pollicipes siluricus Ruedemann 



Relation of the Portage fauna of western New York to that of 

 the Domanik shales of Southern Timan in northeastern Russia. 



In my various papers which have been devoted to the discussion of 

 the Portage (Naples) fauna and its distribution in western Xew 

 York, there has been frequent occasion to point out the striking simi- 

 larity between this very peculiar association of fossils and that found 

 in the " Domanik " of northeastern Russia. My first references to 

 this similarity date back some twenty years but these were based 

 wholly on what had been made known of that distant region by Count 

 von Keyserling who explored it in 1843 and published his account 

 of the rocks and their fossils in 1846. Keyserling indicated the 

 similarity in a very broad way but at that time the New York Portage 

 fauna was not well understood from the brief account of it given by 

 James Hall in 1843, ^o^ ^^'^s the Timan fauna itself comprehended 

 until the materials brought in by the expedition to that coimtry in 

 1 899-1 900, had been studied. While I was engaged in describing 

 the cephalopods of the Naples fauna in detail (Naples Fauna of 

 Western New York, part i), Holzapfel was working out the 

 cephalopods of the Domanik fauna and the two works appeared 

 almost simultaneously, neither writer thus having the benefit of the 

 other's observations. In part 2 of the writer's work under this 

 title, there was occasion to refer at length to the remarkable similari- 

 ties in the two faunas as indicated by Holzapfel's investigations. 

 Although the remaining molluscan fauna of the Domanik beds was 

 then but very partially known I indicated the very close similarities 

 of these distant faunas, based on the evidence so far as then brought 

 out. 



