NO. 



GRAND CANYON FOSSIL FOOTPRINTS GILMORE 



Description. — Stride about 80 mm., width of trackway about 

 115 mm. Hindfoot: Length about 40 mm., width about 40 mm. Five 

 digits. The first toe is short. Third sHghtly the longest while second 

 and fourth are subequal. All three acuminate. The second and third 

 curved slightly outward. Fifth toe, short, stout, with bluntly rounded 



Fig. 4. — Ainmobatrachiis furbatans, new genus and species. Type. 

 No. 11,691, U. S. N. M. Diagram of trackway. About ^ natural 

 size. 



extremity. This digit is directed strongly outward, its longer axis 

 standing nearly at right angles to those of the other toes. In the im- 

 prints of the pes on the left side the fifth toe is longer, more slender, 

 and directed more forward than on the right side. The imprint of 

 the second toe is lacking in most of the tracks of the left side. The 

 sole of the foot is relatively long, exceeding the length of the toes, 

 is rounded behind, and had palmar pads. The toes have the following 



