THE FOSSIL FOOTMARKS OF THE UNITED STATES. 227 



Nos. 1,37, 136, in Cabinet. 



Hind foot. — Pachydactjlous. Divarication of the lateral toes, 

 45° ; of the inner and second, 20° ; of the second and third, 10° ; 

 of the third and fourth, 10°. Length of the inner toe, 0.5 inch ; 

 of the second, 0.7 inch ; of the third, 0.8 inch ; of the fourth, 0.5 

 inch. Breadth of the foot from tip to tip of the outer toes, 1.4 

 inch ; from first to second, 0.6 inch ; from second to third, 0.45 

 inch ; from third to fourth, 0.4 inch ; at the roots of the toes, 1.2 

 inch. Length of the heel, 0.9 inch ; of the foot, 1.7 inch ; of the 

 step, 7 to 7.5 inches ; the same for the fore feet. Track of the 

 fore foot usually a little inside of the hind one. Angle between 

 the axis of the foot and the line of direction, to the right and left, 

 15° to 40°. Distance of the middle of the heel from the line of 

 direction, to 1.5 inch. Width of the toes, 0.2 to 0.3 inch. 



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

 foot. Length of the inner toe, 0.2 inch ; of the second, 0.5 inch ; 

 of the third, 0.6 inch ; of the fourth, 0.35 inch. Breadth from tip 

 to tip of the lateral toes, 0.7 inch ; from the first to the second, 

 0.25 inch ; from the second to the third, 0.25 inch ; from the third 

 to the fourth, 0.3 inch. Length of the foot, 0.6 inch. Position of 

 the foot, in regard to the line of direction, the same as the hind 

 feet. Width of the toes, 0.1 to 0.2 inch. Track shown, of the 

 natural size, fore and hind feet, on Plate 16, figs. 5, 6, from differ- 

 ent specimens. 



This species is dedicated to my early friend. Rev. Chester Dew- 

 ey, LL. D., of Rochester. 



Remarks. — This was the first animal whose tracks were recog- 

 nized as those of a quadruped, in the valley of Connecticut River. 

 I first described them in my Report on the Geology of Massachu- 

 setts, from a specimen from Middletown, on which the inner toe 



