THE FOSSIL FOOTMARKS OF THE UNITED STATES. 229 



fourth, 15°. Length of the inner toe, 0.4 inch ; of the second, 

 0.6 inch ; of the third, 0.9 inch; of the fourth, 0.7 inch. Distance 

 from tip to tip of the outer toes, 0.75 inch ; of the inner and sec- 

 ond, 0.3 inch ; of the second and third, 0.3 inch ; of the third and 

 fourth, 0.25 inch. Breadth of the posterior part, 0.5 inch ; of the 

 toes, about 0.1 inch. Length of the foot, 0.9 inch ; of the step, 

 5.7 inches. Angle between the line of direction and the axis of 

 the foot, 20'. Feet on the right side of the animal diverging to 

 the right ; those on the left side to the left. 



Fore foot. — Divarication of the toes the same as in the hind 

 feet. Axis of the fore foot essentially parallel to that of the hind 

 foot. Track of the fore foot a little nearer to the line of direction 

 than that of the hind foot, and just in advance of the latter. 

 Length of the inner toe, 0.2 (?) inch ; of the second, 0.4 inch ; 

 of the third, 0.55 inch ; of the fourth, 0.4 inch. Distance from tip 

 to tip of the outer toes, 0.4 inch ; of the inner and second, 0.2 

 inch ; of the second and third, 0.15 inch ; of the third and fourth, 

 0.25 inch. Width of the toes (average), 0.08 inch. Length of 

 the foot, 0.55. Track shovi'n, of the natural size, both hind and 

 fore feet, and in a normal position with respect to each other, on 

 Plate 16, figs. 3, 4. 



Remarks. — One of the most distinct of my specimens indicates 

 a very short fifth toe on the outside of the foot, as is shown on 

 Plate 16, fig. 4. But I am not confident whether such is the case, 

 and therefore omit it in the description. This species is distin- 

 guished from the previous one, by being more slender and deli- 

 cate in all its parts. It occurs at Turner's Falls. 



Plate 22, fig. 2, is a sketch of two tracks of the hind and fore 

 feet, copied from No. 158 of the Cabinet, and reduced to one 

 third of its natural size. For so small an animal, the length of 

 the step is very great. 



