64 
Irenesauripus acutus new species 
Plate III, figure 2; and Figure 2 
Type. Cat. No. 8549, Geol. Surv., Canada, consists of plaster cast of 
right pes imprint {See Figure 2) from trackway of six tracks. 
Locality and Horizon. Peace River canyon, north side, about 1 J miles 
upstream from Gething’s mine, on a stratum 216 feet above Grant seam, 
Gething member of Bullhead Mountain formation. 
Description. These tracks, the only ones observed of this species, 
are on a massive bed of clay-ironstone. It was not feasible to collect the 
original imprints, so a plaster mould was taken from which an exact repro- 
duction of the track was made. 
Figure 2. Irenesauripus acutus; type, Cat. No. 8549, Geol. Surv., Canada; 
one-eighth natural size. 
The imprint is large; roughly triangular; the heel is very narrow; the 
digits are long, slender, straight, and of nearly uniform width throughout; 
digits II and III are quite deeply impressed. The digits are more slender, 
the whole track more angular, and the heel narrower than in I. mclearni. 
Digit IV is more widely separated from III than is II. The tracks are 
almost in a direct line and the stride is 1,730 mm., which would suggest a 
rather long-legged animal. 
Greatest length of track, from posterior edge of centre of heel to tip 
of digit III, 535 mm.; from same point to tip of digit II, 405 mm.; to tip 
of digit IV, 415 mm. Greatest breadth, between outer edges of A digits 
II and IV, 400 mm. Divarication of digits II and III, 18 degrees; ofJJI 
and IV, 40 degrees. „ 
Figure 2, Plate III, is from a photograph of a different’ track of the 
same trackway. The two tracks differ in the depth of the heel impression 
and the divarication of digits III and IV. It is quite probable that in the 
track of which the cast was made digit IV is spread more tnan is normal. 
