GRAPTOLITES OF NEW YORK. I'ART 1 619 



Of the above named genera, Temnograptus shows still in its branching 

 the nearest approach to the original dichotomy, the others possessing mostly 

 a more distinctly lateral mode of branching, and it also has still the greatest 

 number of orders of branches ; hence it seems to be nearest to the 

 ancestral Clonograptus forms, and therefore may have been the radicle of the 

 others. 



In the American graptolite beds this group, which in Europe is well 

 developed, is but poorly represented. A single other species besides the form 

 here described has become known, viz Holograptus richardsoni, 

 from the Quebec beds. 



Temnograptus noveboracensis sp. nov. 



Plate 5, flgures 15-20 



Temnograptus cf. multiplex (Nicliolson) liucdemann. N. Y. State Paleontol. 

 An. Rep't. 1902. p.556. 



In graptolite bed 2, representing the upper part of the Tetragraptus 

 shale, frequently occur fragments of a large branching 

 dichograptid of strikingly different habit from the asso- 

 ciated forms. As no entire specimen has been observed, 

 the structure of the rhabdosome could be obtained only 

 by a combination of fragments. This proves the form 

 in question to have possessed a short stout " funicle," 

 from which branched by dichotomy four long denticu- 

 late secondary branches, which in long intervals bifur- 

 cated again. There were branches of at least four 

 orders. 



Description. Branches of first order short (5.5 mm), 

 stout; those of the second and followintf orders long noveboracensis sp.nov. 



' o o Fragment ot rhabdosome 



(50+mni), forming an angle of 130°. Branches .of the fo?m oi tuecaef^Deep kui. 

 higher orders bifurcating under smaller angles, the latter 



apparently diminishing with the increasing distance from the base of the 



rhabdosome. Angles of 70°, 30° and 10° have been measured in various 



