6 NEW YORK STATE MUSEUM 



Niagaran forms from Hamilton, Canada, which lie without our field, and 

 the descriptions of the latter faunas are entirely based upon Canadian 

 material. Moreover, the Graptoloidea of the Lower Champlainic have 

 already been described in Memoir 7 as far as they are found within the 

 boundaries of the State. Of this part of the manuscript there could, for 

 these reasons, be used only the descriptions of a few new Dendroidea from 

 the Niagaran and the Devonic of New York. In case Professor Lapworth 

 should not have extended his work to the remarkable Dendroid fauna of 

 Hamilton, first made known by Spencer, this part of Gurley's work could 

 easily be made complete by the addition of the descriptions of the few 

 western forms and would become a valuable contribution to paleontology. 

 The drawings of a considerable portion of the Dendroidea are finished ; 

 they are pen drawings made on blue prints from photographs, and very cor- 

 rect and effective. A few of them representing the New York species have 

 been used in this publication, supplemented by camera enlargements. 



The manuscript is accompanied by a considerable number of pen draw- 

 ings of graptolites other than Dendroidea. These, being free-hand drawings 

 made by a draftsman, are mostly diagrammatic though carefully executed. 

 We have inserted them in the case of Gurley's new species in the text as 

 his original drawings and supplemented them by camera enlargements and 

 tracings from the types as far as the latter could be found. 



A very valuable addition to the material sent from Washington is a 

 manuscript report by Professor Lapworth on a collection of Stockport, 

 N. Y. graptolites sent to him by Dr Gurley. It contains the descriptions 

 of the new Normanskill species published in 1896 in the Journal of Geology. 

 We have taken the liberty of incorporating Lapworth's important notes on 

 Diplograptus f o 1 i a c e u s in our paper. 



On the whole, it may be fairly said that Dr Gurley has printed in his 

 preliminary publication in the Journal of Geology all that was new or 

 especially worthy of publication, namely the descriptions of all new species 

 — with the exception of a few Dendroidea — and his observations on the 

 morphology of certain hitherto incompletely known species (e. g. Clath- 



