72 
In the case of the type: the greatest length of the track, measured 
from the posterior edge of the heel to the tip of digit III, is 290 mm.; the 
greatest breadth, across digits II and IV, is 282 mm.; the greatest breadth 
of digit III is 76 mm.; and that of the heel, at 40 mm. from the posterior 
edge, is 160 mm.; from the centre of the posterior edge of the heel to tip of 
digit II is 210 mm.; to tip of digit IV, 210 mm.; the divarication of digits 
II and III is 40 degrees, of III and IV, 44 degrees. 
Genus, Amblydactylus new genus 
Genotype, Amblydactylus gethingi new species 
Generic Characters. Very large; bipedal; tridactyle; foot very broad; 
toes broad and short, with proximal ends enclosed in web or pad and 
terminating in pointed hoofs or blunt claws. 
This genus is tentatively referred to Lull's family, Eubrontidse. It 
seems most likely that tracks of this genus were made by a large, bipedal, 
herbivorous dinosaur, though there is no known American form that would 
make such a track. The tracks are too large to have been made by Camp- 
tosaurus, and the hoofs are much too pointed for a member of the Hadro- 
sauridse. It more nearly resembles the tracks from the Wealdon of 
Europe 1 , which are regarded as those of Iguanodon. 2 
Shuler has described, from the Lower Cretaceous, Glen Rose limestone 
of Texas, the tracks of a large, bipedal dinosaur under the name Eubrontes 
(?) titanopelopatidus 3 . To the writer the Texas specimens more closely 
resemble the genus here described than the Triassic Genus Eubrontes , 
though both the track as a whole and the toes are proportionately longer 
than in Amblydactylus. 
Mr. C. N. Strevell, of Salt Lake City, Utah, has kindly sent the writer 
photographs of dinosaur tracks that were collected from the roof of a coal 
mine in Utah, and whose age is given as later Cretaceous. Mr. Strevell 
refers to these tracks as Dinosaur opodes , though it is believed no description 
of them has been published. One of these tracks, which he refers to as 
Dinosauropodes magrauii , rather closely resembles the genotype of 
Amblydactylus in its anterior portion, but is very much longer and there is a 
suggestion of the presence of a fourth toe. 
Amblydactylus gethingi 4 new species 
Plate IV, figure 2; and Figure 8 
Type. Cat. No. 8555, Geol. Surv., Canada, consists of a plaster cast 
of one (? right) track. 
Locality and Horizon. Peace River canyon, north side, about one- 
fourth mile upstream from Gething’s coal mine (Grant scam), Gething 
member of Bullhead Mountain formation. 
mecklea, H. S.: "Ornithichnites of the Wealdon"; Proc. Geol. Soc. London, vol. X, pp. 456-64, PI. XIX (1856). 
*Taylor, Alfred: "On the Footprints of Iguanodon"; Proc. Geol. Soc. London, vol. XVIII, p. 448 (1862). 
*ShuIer, E. W.: Am. Jour. Sci., vol. XLIV, pp. 294-298 (Oct, 1917). 
4 The generic name signifies blunt toed. The species is named in honour of Mr. Neil Gething. 
