GRAPTOLITES OF NEW YORK, PART 2 



2 19 



The branches bear circular or somewhat elongate pits, mostly halfway 

 between the bifurcations or about 3 mm apart from each other; in the 

 thinner terminal branches they approach to 2 mm. 



• Position ami localities. This species is known to the writer from its 

 original formation and locality, viz, the Utica slate of Holland Patent, 

 Oneida co., N. Y. Walcott has also recorded it from Rome, N. Y. and 

 Ami has identified it with doubt in collections from the Utica shale at 

 Montreal and Shequenandad bay and islands. 



Remarks. The characters of M. simplex, notably its thin, flexuous 

 branches, are so striking that it is easily distinguished from 

 its congeners. Whether this flexuosity is due to a lack of 

 firmness of the branches, as it would appear at first glance, 

 is doubtful, for numerous branches show, notwithstanding 

 their small width, considerable substance and it is quite 

 possible that their slenderness was coupled to considerable 

 firmness, the irregular curving of the branches in that case 

 resulting from their wiry character. 



As in M . tenuiramosus, a constant relation exists 



also in this form between the alternating branches and pits, 



and if one follows the central groove [see pi. 12, figf. si one 



o l r ' o jj Fig. 115 m as ti go- 



discerns outlines of tubes proceeding into the branches or fwaicot") 5 . SI E™i P arge* 



ment (x 7) of branch 



rather into short processes which apparently are the bases tu°es inK thecaI aper " 

 of the branches that have been stripped off before fossilization. If the 

 latter is the case, the rhabdosomes bore considerably more branches, at 

 least in the central parts, than would appear now, while the branches of the 

 last order have indeed attained great length without further bifurcation. 



Mastigograptus gracillimus (Lesquereux) 



Plate io t figure 2 



Psilophyton gracillimus Lesq. Am. Phil. Soc. Proc. 1878. 17:164; pi. 4, fig. 2 

 Dendrograptus (Psilophyton) gracillimus Walcott. Utica Slate and Related 



Formations. 1879. P- 21 

 Dendrograptus (Psilophyton) gracillimus Walcott. Alb. Inst. Trans. 1883. 



10: 21 





