THE FOSSIL FOOTMARKS OF THE UNITED STATES. 183 



ones, 4.5 inches. Width of the foot where the toes are articulated 

 to the heel, 1.5 inch; of the heel in its widest part, 8 inches. Dis- 

 tance between the tips of the lateral toes, 9.5 inches ; between the 

 inner and middle toes, 6.7 inches ; between the tips of the middle 

 and outer toes, 6.3 inches. Versed sine of inward curvature in the 

 middle toe, 0.7 inch ; in the inner toe, 0.5 inch. Track shown, of 

 the natural size, on Plate 5, fig. 1 . 



Remarks. — The only locality with which I am acquainted, of 

 the tracks of this remarkable species, is at the Horse Race in Gill, 

 whence I have obtained only one well-characterized specimen. 

 But I measured its dimensions from several specimens in the rock 

 there, so as to feel confident that I have not overrated them ; and 

 yet they are of a very extraordinary character. The animal, how- 

 ever, could not have been as large as the Brontozoum giganteum, 

 already described, or the Otozoum Moodii, yet to be described. 



Species 2. Steropezoum elegans. (PI. V. Fig. 2.) 



Ornithichnites diversus, Am. Jour. Science, Vol. XXIX. fis. 22. 



Ornithoidichnites elegans, Mass. Geol. Report, Plate 41, fig. 28. 



Nos. 67, 68, 70 - 72, in Cabinet. 



Divarication of the lateral toes, 60° to 65° ; of the inner and 

 middle toes, Sb° ; of the middle and outer toes, 30°. Length of 

 the middle toe, 4.4 inches ; of the inner toe, 2.3 inches ; of the 

 outer toe, 2.8 inches ; of the heel, 2.2 inches ; of the foot, 6 to 7 

 inches; of the step, 12 to 21 inches; of the middle toe beyond the 

 lateral ones, 2.4 inches. Width of the foot at the roots of the toes, 

 1 inch ; of the heel, 2 inches. Distance between the tips of the 

 lateral toes, 3 inches ; between the inner and middle toes, 2.8 to 

 3.1 inches; between the middle and outer toe, 2.4 to 2.8 inches. 

 Versed sine of inward curvature in the inner toe, 0.15 inch ; of the 



