536 NEW YORK STATE MUSEUM 



PLATE 24 



Genus diplograptus McCoy 



See plate 25 



Diplograptus foliaceus (Murchison) var. incisus Lapworth 



See plate 25, figures 1, 2 

 Page 347 



i Large typical rhabdosome with long nemacaulus 



2 Frontal aspect of rhabdosome 



3 Synrhabdosome 



4 One of the longest rhabdosomes observed 



5 Largest and most complete synrhabdosome observed 



6 Rhabdosome with typical character of the var. incisus 



7 Small rhabdosome with long virgella 



8 Relatively broad rhabdosome 



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

 New York State Museum. 



