92 ROYAL SOCIETY OF CANADA 



the fourth considerably shorter. The first digit is obsolete, and has left 

 no impression. The sole is scarcely distinguishable. 



Fore foot. Length, 7 mm., width the same. There are four toes 

 somewhat evenly radiate, and covering a smaller angle than a quadrant; 

 the two inner toes are somewhat longer than the two outer. The sole 

 of the foot is nearly obsolete. 



The track is impressed on a soft shaly layer in fine gray sandstone, 

 but the fossil shows only the mould of the footprint. While the marks 

 left by the toes are distinct, those resulting from the impression of the 

 sole is scarcely noticeable. 



The general aspect of the footmark of this species resembles that of 

 Batracliichnus celer, but it is readily distinguished by the number of 

 toe prints. Probably it was an animal of similar habits. 



CURSIPES.^ 



A series of footmarks, small and well preserved, appears to indicate 

 another, but related genus. It is a light footprint, with long slender 

 toes resembling Batrachichnus of Woodworth, but in place of four toes 

 on the fore foot, there are only three. It differs from Asperipes in having 

 a small sole to the hind foot, and in wanting a long heel in the print of 

 the fore foot; also in the length and slenderness of the toes of both feet. 



The print of the fore foot was distinct from that of the hind, and 

 placed some distance behind it, sometimes half way to the next posterior 

 impression of the hind foot. 



These footprints appear to have been made by active animals having 

 comparatively light bodies and long slender toes. 



Cursipes Dawsoni n. sp. (PI. I. Figs. 4a and &), is the type of this 

 genus, and there was one other species. 



The name is in allusion to the supposed rapid movement of the 

 animal. 



In distinguishing the fore and hind foot of this genus, much the 

 same criteria are available as in the preceding genus. (Tio mention first 

 the size of the foot. Although in the typical species there is a con- 

 tinuous series of the three-toed impressions, alternating with those of 

 the footmark showing five toes, they are invariably considerably smaller 

 than the latter, and more lightly impressed. In the other species 

 assigned to this genus, the impression of the fore foot is so light that 

 it may be entirely overlooked. Often only the tips of the toes touched 

 the ground and that very lightly ; but if one were to observe the arrange- 

 ment of these little pits, they would be seen to correspond to that of 

 the three (or sometimes only two of the three) toes in the type species^; 



^ Can. Rec. Sci., Vol. IX., No. 2, p. 102, Montreal, 1903. 



