THE FOSSIL FOOTMARKS OF THE UNITED STATES. 187 



tvveen the axis of the foot and the line of direction, 0°. Distance 

 of the heel from do., 0.5 inch. Track shown, of the natural size, 

 on Plate 6, fig. 3. 



Localities. — Wethersfield and Chicopee Falls. 



Species 3. Argozoum pari-digitatum. (PL VI. Fig. 4, 5.) 



Ornithichnites minimus, Am. Jour. Science, Vol. XXIX. 



Ornithoidichniies isodaciylus, Mass. Geol. Report, Plate 45, figs. 

 38, 39. 



Nos. 98 - 100, 229, in Cabinet. 



Divarication of the lateral toes, 80° to 90° ; of the inner and 

 middle toes, 40° ; of the middle and outer toes, 40° to 50°. Length 

 of the middle toe, 1.5 to 1.8 inch; of the inner toe, 1.1 to 1.3 

 inch; of the outer toe, 1.1 to 1.3 inch. Length of the foot, 1.5 

 to 2 inches ; of the step, 10 to 12 inches (?) ; of the middle toe 

 beyond the others, 0.7 to 0.9 inch. Distance between the tips of 

 the lateral toes, 1.8 inch ; between the inner and middle toes, 1.1 

 inch; between the outer and middle toes, 1.4 inch. Toes nearly 

 straight. Angle between the axis of the foot and the line of direc- 

 tion, 20°. Track shown, of the natural size, on Plate 6, figs. 4 

 and 5 ; the latter, perhaps, a little distorted. 



Localities. — Horse Race and Turner's Falls in Gill, and Weth- 

 ersfield. 



Species 4. Argozoum minimum. (PI. VI. Fig. 6.) 



Ornithoidichniies minimus, Mass. Geol. Report, Plate 15, fig. 41. 



Nos. 85 and 106, in Cabinet. 



Divarication of the lateral toes, 90° ; of the inner and middle 

 toes, 50° ; of the outer and middle toes, 40°. Length of the mid- 

 dle toe, 0.85 inch ; of the inner toe, 0.6 inch ; of the outer toe, 



