lOO KOYAL SOCIETY OF CANADA 



print of the sole, and all were without the trace of a nail. The impres- 

 sion of the sole was heavy, with usually apophyses or swellings on some 

 part of the sole. The impression of the fore foot is smaller than that 

 of the hind, and usually placed behind it. . 



Judging by the length of stride, these animals, notwithstanding 

 their weight, were of active habit, and travelled rapidly over the sand. 



Sauropus Sydnensis, Dawson (Can. Eec. Sci. PI., Figs la and 1&) 

 ir. the type of Baropezia, and there is one other species. 



The generic name is in allusion to the heavy impression made by 

 the sole of the foot. 



In the type species of this genus the two footmarks are much alike; 

 there is not a long heel on either foot to distinguish them ; the number 

 of toes, however, is distinctive. In both feet the normal number of 

 digits is reduced, and the one with three toes may be seen to be 

 smaller than the other, and is therefore assumed to be the fore foot. 



It may also be mentioned (though not much weight can be laid 

 upon this argument) that in the series of footprints which indicates 

 this species, one of the three-toed footprints fails to appear; the series 

 of footmarks runs across a strongly wave-marked slab, and this foot- 

 mark has failed not in hollow of the ripple where the impression might 

 naturally be wanting, but on the ridge of the wave mark; from this 

 one might suppose that the weight of the animal was carried by the 

 four-toed foot which would, therefore, be the hind foot. 



But when an examination of the footprints of the second species 

 of this genus is made, there is much greater reason for concluding that 

 the three-toed foot is the fore foot. The impression is not half as 

 large as that of the four-toed foot; and, moreover, while in the latter 

 the toe prints are arranged on one side of the print of the sole, in the 

 former they are arranged radially around it. 



Baeopezia Sydnensis Dawson, PI. V., figs. 3a-h. 



Stride, 8i inches (215 mm.); Straddle, 5 inches (310 mm.). 



Ilind foot. This shows four toes. Length, 2f inches (70 mm.) ; 

 width, 2 inches (50 mm.). Spread of the toes, 1st to 4th, 2f inches 

 (70 mm.). Sole of the foot oval; inside ball of the foot deeply in- 

 dented. (The first digit may be potentially present in this lobe). 

 Angle of digits, I to IV=80° ; I to 11=30°. 



Fore foot. Placed 3 inches (75 mm.) ; (another 2^ inches, 65 

 mm.) behind the hind foot. Length of fore foot, 2 inches (50 mm.) ; 

 [width. If inches (45 mm.). It has three toes, which arc 2 inches 

 (50 mm.) apart, outside mca.snremont. Solo proportionately wider than 

 in the hind foot. Inner ball of this foot quite heavily impressed, the 



