80 ROYAL SOCIETY OF CANADA 



On another slab, and associated with the larger footprints, are some 

 small trifid impressions which seem to indicate the presence of a still 

 smaller animal, with feet of different form from those of the others. 

 Those small trifid footprints are not dissimilar from those found by Sir 

 W. E. Logan at Horton, in 1841, and which were the first indication of 

 reptilian life discovered in the Carboniferous. 



In addition to the slabs above referred to, there is another in the 

 possession of S. Fleming, Esq., C. E., in Ottawa, of which I have seen 

 a photograph, which is reproduced in the accompanying wood cut. It 

 contains a good series of Sauropus unguifer, above described, and shows 

 best the equidistant character of some of the impressions." 



The following observations were made by the author on the type 

 specimens preserved in the Museum of the Geological Survey at Ottawa, 

 and show some additional particulars. 



Stride, 13 inches; Straddle, 10^ inches. 



Print of the fore foot not usually present. 



Rind foot. Length, 10 inches or more (length to the heel, 8 inches), 

 width, 5-1 inches. The fifth digit has a long curved claw. The fourth 

 has a still longer curved claw. These two claws set off on the outside 

 of the print of the foot, with the claws curving inward; that on the 

 fourth is especially long and curved, and its point was held habitually 

 below the claws of the succeeding digit. The third digit is long and 

 straight, directed somewhat outward, and bears a claw. The second 

 toe is heavy, and bears a claw directed somewhat inward; it appears to 

 have a branch phalange directed parallel to the third (but this apparent 

 branching may be due to an independent movement of this toe. The first 

 toe is heavy, especially near the sole, and is directed somewhat inward. 

 The third, fourth and fifth digits have a knuckle at the base of the claws. 

 The sole is heavy and rounded, and between it and the heel of the palm 

 is an instep or depression; this depression separates a ridge or heel, 

 which is transverse to the axis of the footprint. 



Fore foot. This series does not show the print of the fore foot. 

 Another has the fore foot which is broad and round. There are five 

 digits, the fifth but slightly spread. The fourth, third and second 

 directed forward and somewhat outward. The first digit is directed 

 broadly inward. The claw on the fifth went forward, but in the fourth 

 inward, on the third turned outward, crossing (lie three above it. The 

 second claw turned outward towards the third. The solo of the fore 

 foot was heavy, round and heavily impressed. 



In some parts of this series of footprints the impressions were faint. 

 Most tracks do not show the attitude of the claws, which may have been 

 variable. ' 



