96 ROYAL SOCIETY OF CANADA 



cavÂifer, Dawson; but in that the smooth space is much narrower in 

 proportion. 



This track is on the same fine, gray mud or shale as B. arctus. 

 The very closely set faotsteps ol this animal obscure the marking, 

 and would indicate an animal moving slowly,- or with very short legs. 

 The body was placed so low that it dragged on the ground as the animal 

 moved along. The track has a curved course, nearly parallel to that 

 of B. arctus, and it moved in the same direction as that species. Perhaps 

 it was made by the female of that species. 



Oenithoides.^ 



Under Hylopus (?) tnfidus, Sir Wm. Dawson has described a 

 peculiar little track in which the number of toes is reduced to three 

 on each foot. It has thus fewer toes than any other form of this fauna, 

 and seems worthy of a separate generic name. 



The toes are all directed forward in a fan shape, and thus have 

 a distant resemblance to those of the wading birds, but are much more 

 massive. 



The track left by this creature resembled that of Barillopus in 

 two respects; first that the stride was short, and second that the print 

 of the fore foot was close behind that of the hind and apt to be confused 

 with it. But it differed from- the footstep left by animals of that genus 

 in having a small and narrow sole; so small that Sir Wm. Dawson 

 referred it provisionally to Hylopus. 



These little animals had broad bodies, and probably were sluggish 

 in their movements. The track was as wide as the space between each 

 footmark in the row of footsteps. 



Hylopus (?) tnfidus, Dawson (PI. Figs. 6a and 6&) is the type 

 of this genus. The name Ornithoides is an allusion to the bird-like 

 track, with three toes directed forward in a radiate manner like wading 

 birds. 



Ornithoides trifidus Dawson PI. IV., figs la to c. 



Stride, about 20 to 22 mm. Straddle, 20 mm. 



In this species there arc three toes on the hind and fore feet res- 

 pectively. Generally the impression of the fore foot is covered by the 

 hind; in two or three instances the former is behind the latter, but 

 less than its own length distant from it. 



Hind foot. Length, 9 mm. ; width, 7 mm. There are three toes, 

 of these the first set off from the second and third, which are longer 



^ Can. Rec. Sci., Vol. IX., No. 2, p 104, Montreal, 1903. 



