PLATE 3 



Acantholepis fragilis Newb. 



Page 79 



Drawing from squeeze of impression. Natural size 

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

 Original in New York State Museum 



Onychodus (sigmoides ?) 

 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 



Series of five presymphysial teeth. Natural size 

 Chemung beds, Franklin, N. Y. 

 Original in New York State Museum 



Bothriolepis nitida Leidy 



(S^'e plate 7) 

 Page 50 



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) 



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 



Redrawing of holotype figured by Hall in Report on the Fourth 



District, page 174, figure 69. Natural size 

 Onondaga limestone ; Victor, Ontario co., N. Y. 

 Original in New York State Museum 



