PLATE 3 



Acantholepis fragilis Newb. 



Page 79 



1 Drawing from squeeze of impression. Natural size 

 Ithaca beds, near Truxton, Cortland co., N. Y. 

 Original in New York State Museum 



Onychodus (sigmoides ?) 



Page 169 



2 Detached scale, x 2 



Marcellus shale ; Oran, Onondaga co., N. Y. 

 Original in New York State Museum 



Onychodus hopkinsi Newb. 



{See plates i and 9) 

 Page 169 



3 Series of five presymphysial teeth. Natural size 

 Chemung beds, Franklin, N. Y. 



Original in New York State Museum 



Bothriolepis nitida Leidy 



{See plate 7) 

 Page 50 



4 Terminal portion of " arm " ; sutures between brachial plates oblit- 



erated. Natural size 

 Chemung beds ; Franklin, N. Y. 

 Original in New York State Museum 



Apateacanthus vetustus (Clarke) 



Page 81 



5 Original specimen refigured. Natural size. Drawing from squeeze in 



New York State Museum. 

 Portage (Naples) beds ; near Milo, Yates co., N. Y. 



Machaeracanthus sulcatus Newb. 



Page 84 



6 Redrawing of holotype figured by Hall in Report on the Fourth 



District, page 174, figure 69. Natural size 

 Onondaga limestone ; \'ictor, Ontario co., N. Y. 

 Original in New York State Museum 



