THE FOSSIL FOOTMARKS OF THE UNITED STATES. 173 



ones, 3 inches. Width of the toes, 1 to 1.9 inch. Length of the 

 proximal phalanx of the inner toe, 1 .6 inch ; of the second and 

 third phalanges, 1.6 inch ; of the first of the middle toe, 1.6 inch ; 

 of the second, 1.7 inch ; of the last two, 1.4 inch ; of the first of 

 the outer toe, 1 inch; of the second, 1.3 inch; of the third, 

 1.2 inch ; of the last two, 1.5 inch. Toes straight; claws abnor- 

 mal (bent), making an angle with the axis of the toes of from 30° 

 to 40°. Axis of the foot and line of direction nearly coincident. 

 Tracks shown, of the natural size, on Plate 2, fig. 1, from Mount 

 Holyoke ; and fig. 2, from Turner's Falls, which specimen was 

 destitute of claws and less divaricate than fig. 1, but shows the 

 phalangeal impressions very distinctly. 



Localities. — Mount Holyoke, Northampton, Wethersfield, Tur- 

 ner's Falls, Horse Race, and South Hadley. 



Remarks. — I have found more difficulty in fixing upon the dis- 

 tinctive characters of this and the species which precedes and fol- 

 lows it, than in respect to almost any other species founded on foot- 

 marks, because they seem to pass more or less into one another. 

 Yet one sees that the footmauks could not have been made by 

 the same species at different ages of growth. The present spe- 

 cies is distinguished from the preceding by its larger size, the 

 more massive character of the foot, and by an unusually oblique 

 direction to the claws. It is also rather less divaricate. The ob- 

 lique direction of the claws (from which the specific name is de- 

 rived) may not be constant. It is quite obvious in the specimen 

 from which Plate 2, fig. 1, was taken, as well as in all the speci- 

 mens from the same locality, although these are few. That lo- 

 cality is a remarkable one, namely, the west precipitous side of 

 Mount Holyoke, twenty rods north of Titan's Piazza, where the 

 gray micaceous slate crops out below the trap, and only a kyv feet 



