THE FOSSIL FOOTMARKS OF THE UNITED STATES. 223 



the inner and second toes, 20° to 35° ; of the second and third, 

 10° to 25° ; of the third and fourth, 30° to 45°; of the middle and 

 hind toes, 90° to 100°. Length of the inner toe, 1 inch ; of the 

 second, 1.3 inch; of the third, 1,5 inch; of the fourth, 1.2 inch; of 

 the hind toe, 1 inch. Number of phalangeal impressions made by the 

 inner toe, two, 0.4, 0.3 inch, respectively ; by the second, three (?), 

 0.3, 0.3, 0.3 inch ; by the third, four, 0.4, 0.3, 0.3, 0.3 inch ; by 

 the fourth, three, 0.4, 0.4, 0.3 inch ; by the hind toe, two, 0.4, 0.4 

 inch. Angle between the axis of the foot and the line of direction, 

 25° to 50°. Distance of the middle of the heel from the line of di- 

 rection, 2 inches. Track of the hind foot, of natural size, shown on 

 Plate 13, fig. 1 ; of the fore foot, on fig. 2. The hind foot, also, is 

 shown on fig. 3, with perhaps a fourth toe. Figs. 4, 5, and 6 are also 

 tracks of this or an allied species ; the toes on the hind foot being 

 more or less indistinct, and the leg above the tarsal joint making 

 an impression on fig. 4. 



Locality. — Turner's Falls, Gill. 



Remarks. — The great difficulty of ascertaining the characters 

 of this species, and the paucity of specimens, have made it neces- 

 sary to give numerous sketches, some of which have been already 

 referred to. Plate 21, fig. 1, is a true copy, reduced to one sixth 

 of the natural size, of a slab four feet by two, belonging to T. 

 Leonard, Esq., which that gentleman has very liberally allowed me 

 to study and to copy. Upon it may be seen one row of seven or 

 eight tracks of a Brontozoum, probably B. gracillimum; two parallel 

 trails of a tortoise, the Helcura littoralis, to be described on a sub- 

 sequent page; several insulated tracks, perhaps of Brontozoum, and 

 also of the present species of Anomcepus, both hind and fore feet. 

 The impressions a and b, of hind feet, and c and d, of fore feet, 

 are the most interesting, because they appear to have been made 



