74 
Telrapodosaurus 1 borealis new species 
Plate V; and Figure 9 
Type. Cat. No. 8550, Geol. Surv., Canada, consists of a cast of six 
tracks (two manus and two pes of left side and one each from right side). 
Locality and Horizon. Peace River canyon, north side, about 1| miles 
upstream from Gething's mine, on a stratum 210 feet above Grant seam, 
Gething member of Bullhead Mountain formation. 
Description. There were fourteen tracks in this trackway (seven of 
manus and seven of pes), but casts were made of only six of these. Better 
detail is shown in the pes than in the manus. 
The manus is ahead of and completely separated from the pes. It is 
very short and broad. There appear to be five toes, though in some of the 
tracks only three are well outlined, probably due to inequality in the 
length of the toes and the nature of the surface over which the animal 
walked. In the Upper Cretaceous Ceratopsia only the three inner toes 
bore hoofs, and digits IV and V probably did not appear beyond the sole 
pad. The outer toes of the animal that made these tracks may have been 
too short to make an impression if the weight were thrown on the inside of 
the foot. The foes were enclosed in a large pad, except for the distal 
extremity which was free. This pad seems to have enclosed only the digits, 
differing from that of the pes, in which a metatarsal pad formed the posterior 
portion of the track. Greatest length of manus, 215 mm. ; greatest breadth, 
290 mm. The divarication of the toes is much greater in the manus than 
in the pes, that of the outer toes being more than 180 degrees. Divari- 
cation of digits I and II, 73 degrees; of II and III, 42 degrees; of III and 
IV, 33 degrees; of IV and V, 50 degrees. 
The pes is longer than broad and much of the weight was borne by the 
metatarsal pads. All the phalangial and metatarsal pads appear to have 
been fused into one mass. The toes extend only a short distance beyond 
the pad and terminate in small, rounded hoofs. The distal ends of most of 
the toes are slightly more deeply impressed than the sole of the foot, as is 
indicated in the drawing (Figure 9) by a dotted line. The posterior outline 
of the track is not well defined, but the drawing shows the writer’s inter- 
pretation after a study of all the imprints of this trackway and of those of 
another trackway at the same horizon and locality. There are four toes, 
and the outer one (? IV) is more diveigent than the others. At the posterior 
edge of some of the tracks are triangular depressions, probably made by 
the dragging of the hoofs as the foot was coming to rest. 
Greatest length of pes, measured from the posterior edge of the heel 
to the tip of digit III, 338 mm.; from same point to tip of digit I, 256 
mm.; to tip of II, 328 mm.; to tip of IV, 284 mm. Divarication of digits 
I and II, 14 degrees, of II and III, 21 degrees, of III and IV, 32 degrees. 
The above divarication was measured on what is regarded as the best 
impression. Perhaps better tracks, would show a slight variation. 
The trackway is 810 mm. wide. The length of step, from tip to tip 
of digit III of the left pes, is 1,320 mm. 
1 Tetra podichnites boreralis on Plato V should be Tetrapodosaurm borealis. 
