GRAPTOLITES OF NEW YORK, PART 2 303 



The specimens here figured show the sicular end whose form, on 

 account of the horizontal growth of the first thecae, is ([iiite characteristic ; 

 a long virgella and conspicuous lateral spines but only traces of short 

 spines on the next thecae are seen. The branches are not crossing, possess 

 however a distinct torsion indicating spiral growth. The axillary angle is a 

 little wider than in the typical British specimens. 



The species is associated with D i p 1 o g r . foliaceus, C 1 i m a - 

 c o g r . parvus, Cryptogr. t r i c o r n i s , Nemagr, gracilis 

 and Dicellogr. sextans var. e x i 1 is (no. 2^-jyy). We have also 

 found it in the Normanskill shale at Speigletown, north of Troy, in associ- 

 ation with N e m agr. gracilis and Dicellogr. sextans. 



Dicellograptus gurleyi Lapworth 



Plate 19, figures 7-10 



Dicellograptus gurleyi Lapworth. Ms Rep't. 1890 

 Dicellograptus gurleyi Gurley. Jour. Geol. I 8o6. 4:70 



Lapworth states in regard to this species in his manuscript report on 

 the fossils from the Normanskill shale at Stockport, N. Y., that it is 

 " a new and undescribed form belonging to the group typified by D . 

 patulosus Lapw. and intimately allied to D. vagans (Lapworth 

 manuscript, from the Glenkiln beds of Wanlock Head, South Scotland)." 

 He has furnished a careful description of the species which has been pub- 

 lished by Gurley, in his preliminary notes on North American graptolites, 

 but the form has not been fio;ured. 



The large collection of Normanskill graptolites from Glenmont, prob- 

 ably the best Normanskill collection in number of forms and state of pres- 

 ervation in existence, contains this species in great profusion and in specimens 

 which attain a size greatly surpassing that indicated by the Stockport types. 

 In fact large slabs are so densely covered by the winding branches of this 

 remarkable graptolite that the separate individuals can not be traced in the 

 confused mass. From the Glenmont collection we can materially enlarge 

 the picture of the form drawn by Lapworth. On account of its superior 



