68 
Irenichniles gracilis new species 
Figure 5 
Type, Cat. No, 8552, Geol. Surv., Canada, consists of a trackway of 
five tracks. Paratype: trackway of three tracks on slab, Cat. No. 8558, 
Geol. Surv., Canada. 
Locality and Horizon. Peace River canyon, north side, about 2 miles 
upstream from Gething’s mine, on a stratum 290 feet above Grant seam, 
Gething number of Bullhead Mountain formation. 
Description. The heel pad is not completely developed; the impres- 
sion of digit II is separate from that of the rest of the foot; the toes are of 
uniform breadth and terminate in blunt claws. The tracks are relatively 
short and broad. One shows faint impressions of phalangial pads in digits 
III and IV. Tracks of this species were observed at several horizons about 
midway in the section of track-bearing strata, and in all cases the size and 
shape of the tracks were the same as of those chosen as the type. The 
tracks are approximately in a direct line, and the stride is relatively long. 
In the type the stride varies from 790 mm. to 670 mm., and in the paratype 
is only 535 mm. This shorter stride is longer in proportion to the length 
of the track than in the case of the other species here described. This 
would suggest a very long-legged animal. All digits terminate in blunt 
claws, which are not deeply impressed. 
The greatest length of the track, measured from the posterior edge of 
the heel to tip of digit III, is 150 mm.; from same point to tip of digit II, 
118 mm.; to tip of digit IV, 130 mm.; length of impression of digit II, 76 
mm.; average breadth of digits, 20 mm.; greatest breadth of track, 165 
mm. The divarication varies somewhat, but in the central track of the series, 
which shows the best detail, the divarication of digits II and III is 38 
degrees, of III and IV, 40 degrees. 
Genus, Gypsichnites 1 new genus 
Genotype, Gypsichnites pacensis new species 
Generic Characters. Bipedal; semidigitigrade; tridactyle; heel broadly 
rounded and complete; foot short and broad; toes broad, partly enclosed 
in pad or web, and terminating in bluntly pointed hoofs. 
Because of the broad toes terminating in pointed hoofs, this genus is 
tentatively referred to Lull’s family Eubrontidse. If Lull is correct in 
assigning this family to the suborder Theropoda 1 2 , the present assignment 
is probably not justified for, in all probability, Gpysichriites represents the 
tracks of a bipedal herbivorous dinosaur. These tracks might well have 
been made by a Cimpfoscmrws-like form. 
Tracks of this genus were observed below the Grant seam, as well as 
at the horizon from which the type and paratype were collected. 
1 The generic name signifies Cretaceous stony tracks. 
•Lull, R. S.: Geol. and Nat. Hist. Surv., Conn., Bull. XXIV, p. 194 (1915). 
