GRAPTOLITBS OF NEW YOUK. I'AUT 1 717 



fragment of his Coenograptiis gracilis, and the second species has 

 then been considered as the genotj^pe of Nemagraptus. Tliis genus has had a 

 somewhat checkered career ; at first it Avas not recognized b)^ some, as Hall, 

 but later its right of existence Avas asserted by Lapworth and Gurley. Dr 

 Gurley collected identical material in the same horizon as Emmons (Normans- 

 kill shale, cited by Emmons as Taconic slates of Columbia county). From 

 this genus, as based on N e m a g r a p s u s c a p i 1 1 a r i s , in Avhich Emmons 

 was unable to find apertures, the present one is distinguished by its lack of 

 branching^ Gurley has erected still another genus, Phycograptus, for 

 similar threadlike bodies, which also have been frequently observ'^ed by the 

 writer in the Normanskill shales. This genus, to which two species are 

 referred, is likewise repi'esented by unbranching, long, carbonaceous 

 fibers with a central row of pits or apertures, but the fibers are 

 distinctly segmented by partitions midway between the pits and possess 

 marginal grooves. The writer has obtained a specimen of Phycograptus 

 at Mt Moreno, to be more fully described and figured later on, which shows 

 a short cylindric axis, from which the innumerable Ph}cograptus fibers 

 proceed in verticillate arrangement. Whether the fibers of Strophograptus 

 are similarly connected with a stem is not known as yet ; but their regular 

 subparallel arrangement in bundles would indicate that the component fibers 

 of these bundles belong together. 



Strophograptus trichomanes sp. nov. 



Plate ♦, flirures 17-20 



Description. Bundles of thin, fiexuous fibers (branches?), the fibers 

 attaining a length of 13 cm and a width of .2 mm. Thecal apertures circular 

 to transversally oval pits on slight prominences, numbering about 8 in 10 mm ; 

 fibers contracted between the pits by one fourth or one third of their width. 



' Elles and Wood have meanwhile, in the tliird part of the Monograph of the British 

 Graptolites very properly replaced Hall's term CoenograptuF, which though younger has 

 been generally accepted, by Emmons's term Nemagraptus which has the right of priority. 



