532 NEW YORK STATE MUSEUM 



PLATE 22 



Dicranograptus spinifer Lapworth 



See plate 23, figures 2, 3 

 Page 330 



i Portion of slab with a number of specimens showing the usual expression 

 of the form. Natural size 



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

 The original is in the New York State Museum. 



