THE FOSSIL FOOTMARKS OF THE UNITED STATES. 175 



Species 5. Brontozoum gracillimum. (PI. II. Fig. 3.) 

 Ornithoidichnites gracillimus, Am. Jour. Sci., Vol. XLVII., Plate 

 3, fig. 4. 



Nos. 89, 129, 130, 134, 135, 158, 167, in Cabinet. 

 Divarication of the lateral toes, 50^ ; of the inner and middle 

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

 dle toe, 2.2 inches ; of the inner toe, 1 .7 inch ; of the outer toe, 

 2 inches ; of the claw, 0.4 inch ; of the foot, 2.5 inches ; of the 

 step, 7 to 8 inches. Distance between the tips of the lateral toes, 

 1.9 inch; between the tips of the inner and middle toes, 1.2 

 inch; between the tips of the outer and middle toes, 1.35 inch. 

 Projection of the middle toe bejond the lateral ones, 0.9 inch. 

 Width of the toes, 0.3 to 0.5 inch. Length of the proximal pha- 

 lanx of the inner toe, 0.5 to 0.6 inch ; of the last two, 0.4 to 0.5 

 inch ; of the first on the middle toe, 0.5 to 0.6 inch ; of the sec- 

 ond, 0.4 to 0.5 inch ; of the last two, 0.3 to 0.4 inch ; of the first 

 on the outer toe, 0.45 inch ; of the second, 0.4 inch ; of the third, 

 0.45 inch ; of the last two, 0.6 inch. Toes straight ; claws slight- 

 ly abnormal. Angle between the line of direction and the axis of 

 the foot, 0° to 10°. Distance of the heel from the line of direc- 

 tion, 0.8 inch. Track shown, of the natural size, on Plate 2, 

 fig. 3. 



Localities. — Turner's Falls, Chicopee Falls, Wethersfield. 



Species 6. Brontozoum parallelum. (PI. III. Figs. 3, 4.) 



Figured and described in Am. Journal of Science, Vol. IV., New 

 Series, p. 50. 



Nos. 137, 234, in Cabinet. 



Divarication of the lateral toes, 15° to 20° ; of the inner and 

 middle toes, 5° to 6° ; of the outer and middle toes, 8° to 15°. 



