530 NEW YORK STATE MUSEUM 



PLATE 21 



Dicranograptus nicholsoni Hopkinson 



See plate 20, figures 3-5 

 Page 317 



1 Specimen with very divergent uniserial stipes 



Utica shale, Saratoga lake, N. Y. 



Dicranograptus nicholsoni van parvangulus Gurley 



Page 320 



2 Two associated typical specimens 



Normanskill shale, Mt Moreno near Hudson, N. Y. 



Dicranograptus nicholsoni van diapason Gurley 



Page 322 



3 Portion of a slab with group of typical specimens 



4 Two of the largest specimens observed 



Normanskill shale, Glenmont, N. Y. 



5 Two associated specimens with a little more divergent uniserial stipes 



Normansville shale, Glenmont, N. Y. 



Dicranograptus ramosus Hall 



See plate 23, figure 1 

 Page 323 



6 Very large specimen with little divergent uniserial stipes 



7 Specimen with more divergent stipes 



Normanskill shale, Stockport, N. Y. 



All figures are drawn in natural size. The originals of figures i to 



5 are in the New York State Museum ; those of figures 6 and ~ 



in the National Museum. 



