542 



NEW YORK STATE MUSEUM 



PLATE 26 



Genus glossograptus Emmons 



See plate 27 



Glossograptus ciliatus Emmons 



See plate 27, figures 1-4 

 Page 379 



i Small rhabdosome showing numerous curved spines and beginning 

 vesicular inflation of nemacaulus 



2 Small rhabdosome with few straight spines and larger inflation 



3 Older rhabdosome with both straight and curved spines and relatively 



laro-e inflation of nemacaulus 



4 Specimen with relatively long curved spines 



5 Specimen with short spines (broken off through oblique splitting of 



rock) 

 Normanskill shale, Glenmont, N. Y. 



Glossograptus ciliatus var. debilis nov. 



Page 384 



6 Typical specimen (cotype) 



7 Portion of slab with group of specimens showing the common aspect of 



the form (cotypes) 



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



Glossograptus ciliatus mut. horridus nov. 



See plate 27, figure 5 

 Page 383 



8 Typical aspect of the form (holotype) 



9 Specimen showing three axes 



Graptolite shales, Summit, Nev. 



