498 NEW YORK STATE MUSEUM 



PLATE 5 



Genus desmograptus Hopkinson 



See plates 1, 4 



Desmograptus becraftensis sp. nov. 



Page 179 



i Type specimen (cotype) 



New Scotland beds, Becraft Mt near Hudson, N. Y. 



Desmograptus vandelooi sp. nov. 



Page 181 



2 Type specimen (holotype) 



Hamilton shale, Hemlock creek, Ontario co., N. Y 



Genus dictyonema Hall 



See plates 1-4 



Dictyonema crassum Girty 



Page 165 



3 Most complete rhabdosome observed 



New Scotland limestone, Catskill, N. Y. 



4 Type specimen (cotype) 



New Scotland limestone, Clarksville, N. Y. 



Dictyonema megadictyon Gurley 



Page 168 



5 Type specimen (holotype) 



Onondaga limestone, Leroy, N. Y. 



Genus ptiograptus nov. 

 Ptiograptus percorrugatus sp. nov. 



Page 176 



6 Type specimen (holotype) 



Middle Devonic (Waterlime), Louisville, Ky. 



All figures are drawn in natural size. The originals of figures i -3 

 and 6 are in the New York State Museum ; that of figure 4 is in 

 Yale University Museum and that of figure 5 in the National 

 Museum. 



