86 ROYAL SOCIETY OF CANADA 



We think there is reason to suppose that the footmarks in the type 

 specimen though so exactly simulating in tlieir position the footsteps 

 of the two sides of a single track in the arrangement of the impressions 

 of both fore and hind feet, really belong to different tracks running 

 parallel to each other. In all the other footmarks of tliis age with 

 which we are acquainted, the toes are efther equal for the two sides of 

 the foot, or (as is more usually the case, the inner ones are shorter). 

 Tf we assume that the footmarks of this group are part of one track, it 

 will ha,ve to be admitted that the ovter ones are the shorter. 



DROMOPUS, Marsh. 

 Dromopus velox, n. sp. PI. II, fig. 2a, h. 



Stride and Straddle unknown. The fore foot is placed somewhat 

 in front of the hind and nearer the axis of the body than the hind foot. 

 Hind foot length, 40 (or 45) mm. ; width, 40 mm; The fifth digit some- 

 what off from the others ; the spread of the toes nearly covers a quadrant ; 

 toes long and slender especially the third and fourth, the first is weak 

 and about half of the length of these; the long toes show phalanges. 

 Sole 12 (or 25) mm. long, 25 mm. broad, distinctly impressed. [The 

 apparent extra length of the heel may be due to the foot having slidden 

 in the mud. Angle of digits, I-V=95° I-II,=45.] 



Fore foot. Length, SO (or 35) ram., width, 15 mm., has 3 (or 4) 

 toes and a rather long sole. [The only print of a fore foot known is not 

 complete and leaves the number of toes doubtful.] Toes turned for- 

 ward. Sole 12 (or 15) mm. long, 15 mm. broad. Angle of digits, 

 n-IV,=35°. 



This is not unlike Marsh's species D. agilis, but the toes are not 

 so wide spread and the species is somewhat smaller. Several separate 

 examples of the print of the hind foot are in the collection at Redpath 

 Museum, but no consecutive series of tracks. 



ASPERIPES.^ 



This genus is characterized by having five toes on the supposed 

 hind foot but only three on the supposed fore foot. The latter is 

 usually placed behind the hind foot, sometimes midway between two 

 prints of the latter. 



In the hind foot the fifth toe sets off from the rest and is near the 

 back of the footprint; the other toes also are widely spread and are 



^ Can. Rec. Sci., Vol. IX., No. 2, p. 99, Montreal. 



