28 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 80 



ness from all others, but in the expectation of again visiting the 

 locality, its description was deferred until another section of the trail 

 could be secured. In addition there is a second specimen (No. 11.500, 

 U. S. N. M.) in the 1926 collection that may also be referred to this 



Fig. n. — Ayostopus mcdius. Type. No. 11,509, U. S. N. M. Dia- 

 gram of trackway. About 1 natural size. 



genus and species, but the ])reservation is such that it throws no 

 additional light on the detailed foot structure, and needs no further 

 mention here. 



The. characteristic foot structure of this short-legged, wide-bodied 

 animal shows it to be clearly referable to the genus Agostopus. From 



