GRAPTOLITES OF NEW YORK, PART 2 355 



and it can be easily conceived that the limestone specimens which are 

 plastically preserved would, il compressed in shale, present the general 

 aspect of that Normanskill form. Still the thecae in their mature parts 

 are distinctly farther apart than those of 1). foliaceus var. incisus 

 and the whole form is correspondingly coarser in its habit than even 

 this largest Diplograptus of the New York beds. In the latter feature 

 it reminds strongly of 1) . foliaceus var. t r i f i d u s , an earlier form 

 of the same region. 



Synonymy of Diplograptus foliaceus 



Among the synonyms of I), foliaceus there have been cited here 

 a number of Emmons's species. In doing this we have followed Gurley's 

 list of American graptolites [1896, p. 97 1 since it appears from his manu- 

 script notes, printed below, that he had made special efforts to clear up the 

 synonym)- of these extremely bad species. These species are : 



D. dissimilaris Emmons, 1856 D. rugosus Emmons, 1856 



D. laciniatus Emmons, 1856 D. simplex Emmons, 1844 



D. obliquis Emmons, 1856 



. Says Gurley : 



Relative to the synonymy of this species the name first applied to it in 

 America was F 11 c o i d e s s e c a 1 i n u s, Eaton. We have the authority 

 of Professor Hall 1 for the statement that this was never published by 

 Professor Eaton himself. Professor Hall says : 



"The Graptolithus, from the Hoosic slate quarries was named by Pro- 

 fessor Eaton, Fu co ides secalinus, and the specimens were thus 

 labeled in the cabinet of the Rensselaer school at Troy, as known to the 

 writer from 1832 to 1836 but we have been unable to find any published 

 descriptions." 



This species was first published in America by Dr Emmons 2 (under 

 the name Fucoides simplex) in 1844. It is the only one to which 

 the name simplex Emmons is properly applicable. To define it more 

 clearly it is the one which includes as synonyms the p r i s t i s ( Hisinger) 

 Hall, secalinus (Eaton) Hall, amp lexi cau 1 i s Hall and several 

 other names. It is to be most carefully distinguished from two other 



'Hall, James. 1865, Can. Org. Rem. Dec. 2, p.64 and id. N. Y. State Mus. Nat. 

 Hist. 20th An. Rep't. 1868. p. 233. 



2 Emmons, Ebenezer. Taconic System, p. 27, t. 5, f. 1. 



