PLATE VI. 



Fig. 1. Trachodon ( Pteropelyx) marginatus, Lambe, left humerus, viewed obliquely from inner front ; 

 one-third natural size. Page 71. 



Fig. 2. The same, from outer rear. 



Fig. 3. Trachodon (Pteropelyx) marginatus, impression of epidermis, from the sandstone in which the 

 above specimen was embedded ; natural size. 



r, radial crest ; /(, head ; i, inner tuberosity ; o, outer tuberosity ; c, outer condyle. 



