104 ROYAL SOCIETY OF CANADA 



Fore foot " plantigrade." Length and width each about 2 inches 

 (50 mm.). There axe five toes, spreading, the third and fourth longest; 

 the first toe was heavily impressed and had a strong claw; the other 

 toes probably had claws. The sole was prolonged into a rounded lobe 

 on the outer side; it was about an inch in length each way. The fore 

 foot was in line with the hind. Angle of digits, I.-V.=105° ; IV.- 

 V.=10°. 



This animal was Cheirotheroid in the separation of the fifth digit 

 of the hind foot from the others. This and the fact that it had only 

 four toes on the hind foot, and the heavy sole of this foot, distinguish it 

 from Hylopus Logani. The tracks are preserved on a fine grained 

 layer of gray sandstone, having wave undulations, and somewhat pitted 

 with raindrops. After the animal walked over the surface a fine soft 

 mud washed into the tracks and helped obscure them, though the 

 original impressions appear to have been made on a sulrface so s^oft that 

 the mud at the sides of the toeprints partly flo^ved in. 



The more numerous toes on the print of the fore foot might lead 

 to the supposition that it was the hind foot; but the other is regarded 

 as the print of the hind foot for the following reason. The sole of the 

 footmark is longer and larger ; the fifth digit sets off decidedly from the 

 others; the other three digits are subparallel, in this latter feature the 

 footprint compares with that of Barillopus. On the contrary the print 

 of the fore foot though it has a sole of considerable size, has the toe 

 prints regularly radiate and the full number of digits. 



The animal was walking nearly parallel to the wave undulations 

 of the layer of sand on which it trod, and at a, rapid pace. 



(tEneral Eemarks. 



The relation of many of these footprints to those of Amphibians 

 is evident from a comparison with the footprints of a frog, as given by 

 Dr. Jas. Deane in his posthumous w^ork " Ichnographs of the Sand- 

 stones of the Connecticut Eiver," Boston, 1861, Ed. T. T. Bouvé. See 

 Can. Eec. Sci. Plate 1, Figure 1. This shows the habit of these 

 creatures of placing the print of the fore foot in the line of the series 

 of footmarks within that of the hind (Cursipes Dawsowni; Dromillopus 

 celer, Baropezia sydnensis, B. abscissus are examples). 



Then as regards the number of toe marks, in the frog the hind foot 

 exceeds the fore foot, and the toe marks are closer together, but we do 

 not observe the peculiar separateness of the fifth digit which is seen in 

 many tracks of the Carboniferous animals, and markedly in some of 

 those of the Trias. Also in regard to the first digit it may be noted 



