24 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 77 



served, but the toes of the forefeet are usually cut off by the flow 

 of sand crowded out by the heel of the hindfoot, thus destroying 

 the evidence for a positive determination of the length of the toes 

 of the manus. 



Fig. 16. — Agostopus matheri. Type, No. ii,i3S, U. S. N. M. Dia- 

 gram of trackway. ^ natural size. 



In the presence of four toes on the hindfoot and five on the fore, 

 these tracks closely resemble Megapesia pineoi^ from the Lower 

 Carboniferous of Nova Scotia, but here their similarity practically 

 ends, since they differ so much in size, length and arrangement of 



^ Matthew. G. F., Proc. and Trans. Roy. Soc. Canada, 2d Ser., Vol. 10, 1904, 

 pp. 102-104, pi. 2, figs. 4-4a. 



