52O NEW YORK STATE MUSEUM 



PLATE 16 



Genus nemagraptus Emmons 



See plate 17 



Nemagraptus gracilis (Hall) 



Page 277 



1 Typical specimen 



2 Young rhabdosome 



3 Large specimen, showing the length attained by the main stipes 



4 Young rhabdosome showing the early development of the secondary 



branches 

 9 A variety characterized by extreme slenderness of branches 

 Normanskill shale, Kenwood, N. Y. 



Nemagraptus gracilis var. approximatus nov. 



Page 287 



5 Portion of typical mature specimen (cotype) 



6 Younger specimen (cotype) 



Normanskill shale, Kenwood, N. Y. 



Nemagraptus gracilis var. distans nov. 



Page 286 



7 Type specimen (holotype) 



8 Fragment with extremely slender and distant branches 



Normanskill shale, Glenmont, N. Y. 



All figures arc drawn in natural size. The originals are in the New 

 York State Museum. 



