78 



NEW YORK STATE MUSEUM 



noted in the Graptolites of New York, part 2 (title 60, p. 151). Like 

 other Dictyonemas this species also shows a tendency to undulating, 

 alternatingly adnascing branches in the proximal portion, giving that 

 part a Desmograptuslike aspect, while it is a typical Dictyonema in 

 the distal portions (see text fig. 13). - 



Dictyonema multiramosum nov. 



PI. 2, fig. 16 



Description. Rhabdosome of small size (32 mm high) apparently 

 cyathiform, arising from a short thick stem. Branches extremely 



thin and closely arranged, about .5 mm apart 

 and .2 mm wide, bifurcating at frequent inter- 

 vals, slightly undulating; mostly of rather 

 straight appearance, frequently coalescing where 

 brought in contact by the wavy form of the 

 branches, or where the latter are straight, with 

 thin dissepiments in long intervals. Thecae 

 not clearly seen. 



Horizon and locality. Schenectady beds near 

 Rotterdam Junction, N. Y. 



Remarks. But a single specimen of this 

 species was obtained and this being inclosed in 

 a sandy shale, is far from perfect in preserva- 

 tion. It is therefore possible that the species 

 rhab- should be rather referred to Desmograptus 

 which it approaches in some portions of the 

 frond. 



We have not observed any species in either 

 the Trenton or Utica shales which approaches 

 D . multiramosum in the extreme delicateness of the 

 rhabdosome. 



Fig. 16. 

 Dictyonema 

 multiramosum 

 nov. 



Portion of 

 dosome, x 5. 



Schenectady beds, 

 Rotterdam Junction, 

 N. Y. 



Dicranograptus nicholsoni Hopkinson van parvulus nov. 



The Canajoharie shale at Morphy's creek near Pattersonville, 

 N. Y., contains in its basal layers, within a few feet of the under- 

 lying Glens Falls limestone a diminutive form of Dicrano- 

 graptus nicholsoni which deserves recognition as a variety, 

 as all the specimens of this bed retain uniformly their peculiar 

 character. 



