PLATE XVIII. 



PAGE 



Figs. 1, 2. Pleurocqclus nanus Marsh. (After Marsh.) 188 



1. Front, proximal, distal, and side views of metatarsal. X V2- Near 



Muirkirk. (2267 U. S. N. M.) 



2. Outer, front, proximal, and inner views of ungual phalanx. X V2- 



Near Muirkirk. (2267 U. S. N. M.) 



Fig. 3. Pleuroccelus altus Marsh 200 



Front and side views of tibia and fibula. X %. Near Muirkirk. 

 (4971 U. S. N. M.) 



517 



