THE FOSSIL FOOTMARKS OF THE UNITED STATES. 189 



Species 1. Platyfterna Deaniana. (PI. VII. Fig. 1.) 

 Ornithoidichniies Deanii, Mass. Geol. Report, Plate 42, figs. 31, 



32, and Plate 44, fig. 37. 

 Nos. 78 - 83, 96, in Cabinet. 



Divarication of the lateral toes, 70=' ; of the inner and middle 

 toes, 45° ; of the middle and outer toes, 25°. Length of the mid- 

 dle toe, 3 inches ; of the inner toe, 1.5 inch ; of the outer toe, 1.8 

 inch ; of the heel, 1.1 to 1.2 inch ; of the foot, 4 to 4.5 inches ; 

 of the step, 9 to 12 inches; of the middle toe beyond the rest, 1.8 

 inch. Width of the heel, 0.9 to 1 .2 inch ; at the place of inser- 

 tion of the toes, 1 inch. Distance between the tips of the lateral 

 toes, 2 to 2.5 inches; between the inner and middle toes, 2.1 to 

 2.15 inches ; between the outer and middle toes, 2 to 2.35 inches. 

 Versed sine of the curvature of the inner toe, inwards, 0.17 inch ; 

 of the middle toe, inwards, 0.12 inch ; of the outer toe, outwards, 

 0.22 inch. Track shown, of the natural size, on Plate 7, fig. 1. 



Locality. — Wethersfield, at the Cove ; on red shale. 



This species is dedicated to Dr. James Deane, of Greenfield, 

 who first called my attention to the subject of footmarks, and who 

 subsequently investigated it with much success. 



Species 2. Platyfterna tenuis. (PI. VII. Fig. 2, 3.) 

 Ornithoidichnites tenuis, Mass. Geol. Report, Plate 43, figs. 



33, 34. 



Nos. 84 - 87, 208, in Cabinet. 



Divarication of the lateral toes, 45° to 60° ; of the inner and 

 middle toes, 20° to 30° ; of the middle and outer toes, 25° to 30°. 

 Length of the middle toe, 2 inches ; of the inner toe, 1 inch ; of 

 the outer toe, 1.3 inch; of the heel, 0.6 inch; of the foot, 2.1 to 

 2.7 inches; of the step, 1 {?) inches. Width of the heel, 0.6 inch. 



