GRAPTOLITES OF NEW VTORK, PART 2 145 



DESCRIPTION OF GRAPTOLITES 



Order i dendroidea Nicholson 

 Family DENDROGRAPTIDAE Roemer. 



DENDROGRAPTUS Hall 



See N. Y. Nat. Mus. Mem. 7, 11.57S 



Dendrograptus rectus sp. nov. 



Plate 8, figure 2 



Description. Rhabdosome bearing numerous, subparallel branches of 

 rigid appearance which bifurcate frequently and at very acute angles ; the 

 latter being smallest in the distal bifurcations (5°-io°, and about 70° in the 

 basal portions). The type, an imperfect specimen, is 61 mm long and 

 45 mm wide ; its branches are 7 mm wide in the lateral view. 

 The latter exhibits rows of prominent thecae which are all 

 turned toward the inside of the rhabdosome, and to the 

 naked eye seem acutely pointed. Enlarged, they are found 

 to overlap about one half their length, diverge at io° from 

 the axis of the branch and possess tonguelike projecting 

 outer apertural margins and concave, notched lateral apertural 

 margins. The thecae number 14 in 10 mm. grap'tus "cus 



° sp. nov. Fragment, 



Position and locality. In the dark greenish gray pr°rfie"?iew hec x a 5 in 

 Clinton shale, overlying the lower ore bed at Clinton, Oneida co., N. Y. 



Remarks. This form bears no similarity to an}' of the Siluric Den- 

 droidea, but reminds one in the character of its thecae of some of the earlier 

 species, as D . f lui tans from the Beekmantown shales, and in its general 

 habit it approaches most nearly to two other Beekmantown forms, viz, 

 D. fruticosus and D. gracilis. With these it apparently belongs 

 to the small group, which with the genotype will, after the final splitting up 

 of the genus, be left in Dendrograptus s. str. 



