^f. The Ottawa Naturalist. l^^> 



Ornifholesies is supposed to have pursued such "agile and 

 delicate prey " as the Jurassic birds ; Ormt/wmtmus alius, also a 

 rapid runner but of larger build, with a more robust manus ot a 

 strong grasping capacity, may be supposed to have attacked 

 larger animals, possibly those not unworthy even of the noUce 

 of his more bulky and formidable contemporary Deinodon horndus 



of Leidy. 



Ottawa, Dec. 23, 1903. 



EXPLANATION OF PLATES. 



Plate L 



Phalanges of second digit of manus of Ornithomimus alius. 



natural size. 



Figure i.-First phalanx viewed from the side ; ^n, from behind ; ,/-, from in 



front ; ic, from below. 

 Figure 3. -Second phalanx viewed laterally ; 2«, from behind; zb. from in 



front ; zc, from below. 

 Figure 3.-Third or terminal phalanx as seen from the side; 3«, from behind; 

 36, from below. 



Plate IL 



Figures 4 and s.-Lateral views of the phalanges, figured in Plate I to 

 ^ shew rotation. Figure 5 represents the pos.t.on ot the phal- 



anges when grasping. 

 Figure 6.— The same phalanges from below. 



Figure 7.-Ungual phalanx of manus oi Ornilho.nmns alius ; probably that 

 . of third digit. 



The above figures natural size. 

 Figure 8.-Terminal phalanx of second digit of manus of OrnithoUstes 



hernurnni, Osborn, side view ; one-half natural size. 

 Figure 9. -Terminal phalanx of m^..s oi Omithomimus sedens, Marsh, s.de 

 view; one-half natural size. 



