GRAPTOLITES OF NEW YORK, PART 2 1 -g 



Desmograptus pergracilis ( I Iall & Whitfield) 



Dictyonema pergracile Hall & .Whitfield. N. Y. State Mus. Nat. Hist. 24th An. 



Rep't. 1872. |i.:8i 

 D i c ty n e m a p e r g r a c i 1 Hall & Whitfield. N. V. State Mus. 27th An. Rep't. 1875. 



]''• 9. fi g- 3 s 

 Dictyonema pergracile Spencer. Acad. Sci. St Louis. Trans. 1884. 4:564,577 

 Dictyonema pergracile Spencer. Mus. Univ. State Mo. Bui. 1884. 1: 14, 17 

 Dictyonema pergracile Pocta. Syst. Sil. Boheme. 1894. v. 8, t. r, p.193 

 Dictyonema pergracile Gurley. Jour. Geol. 1896. 4:308 



Regarding this species Dr Gurley remarks : 



The Niagara collections from Hamilton yield no material which can 

 with certainty be referred to this species. Indeed, in the absence of a 

 figure, it would be hard to feel much certainty as to any identification even 

 of the material from the type locality. It is not impossible, however, that 

 the form I have named Dictyonema g r a c i 1 e f i 1 i r a m u s (in manu- 

 script) may prove to be pergracile, as it agrees with it as far as the 

 meager diagnosis goes. 



The figure of this species, together with those of the other species from 

 Louisville was not published until the 27th Report of the New York State 

 Museum, a fact which evidently has been overlooked by Gurley and the 

 other authors, who cite the form. Pocta would surely have referred this 

 form to Desmograptus which genus is well represented in his fauna and 

 recognized by him, had he seen the figure and Gurley would not have 

 thought of the possibility of its identity with his Dictyonema g r a c i 1 e 

 f i 1 i r a m u s. 



Professor Whitfield informs me that the type of this species was in the 

 cabinet of Dr Knapp. It has probably been sold lately with the Hall 

 collection to Chicago University and is at present inaccessible. 



Desmograptus becraftensis sp. nov. 



Plate 5, figure i 



Description. Rhabdosome large ; an incomplete specimen measuring 

 30 cm in diameter ; broadly infundibuliform and rapidly expanding. 

 Branches throughout frequently bifurcating and regularly undulating, 

 forming by refusion with the neighboring branches narrow, elongate 



