82 
annectens or T. edmontoni . The dental magazine, which occupies one-half 
the total length, contains forty-four vertical rows of teeth. 
Except at the ends of the series there are three teeth in the triturating 
surface showing progressive stages of wear, e.g., one enamel-bearing crown, 
one partly worn stub, and one root. In some cases there is a tip of a third 
root. The teeth are largest at the midlength of the magazine and decrease 
in size toward either end, but the proportionate width is about the same. 
The enamel face of the dentary teeth is diamond shaped and proportionately 
intermediate between E. regalis and T. annectens , the length being slightly 
more than twice the width. The apex is bluntly pointed and the median 
keel is high, has a broad base, and runs the entire length with very slight 
difference in elevation from end to end (Figure 3 A). The lateral borders 
are thickened, thus giving raised edges and somewhat concave lateral faces. 
This is best shown in the lower part of the larger teeth. The lateral 
borders are smooth except for slight papillations on the anterior teeth. 
The surangular, angular , and prearticular closely resemble those 
elements in E. regalis in form, proportion, and position. 
The articular is a small bone which is wedged in between the postero- 
superior parts of the surangular and thin, vertically placed, prearticular. 
It is broadest anteriorly and from here gradually tapers to a thin edge 
at the posterior extremity. From the superior surface it thins rapidly, 
inferiorly, as it wedges in between the surangular and prearticular. The 
anterior half of the antero-superior surface is flat or slightly cupped, 
thus forming the small contribution of the articular to the mandibular 
cotylus. This articular surface faces outward and upward, this being 
due to the internal edge of the bone being at a higher level than the outer. 
Comparative Measurements of Skull 
— 
T. saslcatr- 
chewanensis 
T. edmon- 
toni 1 
T. annec- 
tens 1 
Mm. 
Mm. 
Mm. 
Total length of skull 
786 
938 
1,100 
380 
Length of quadrate 
337 
340 
Greatest hreadth of premaxillm 
226 
Greatest length of premaxillse 
453 
Length in front of teeth 
300 
310 
420 
T.nn{ft.h of nasal 
442 
Length of frontal f external surface) 
150 
Breadth of frontal r fhetween orhit.s) 
170 
Greatest height of orhit (diagonal) 
193 
Greatest hrpadth of orhit ( superior) 
156 
Length of Rti pratem poral fossa 
112 
Bread th of supra temporal fossa 
42 
Height, of infratemporal fossa 
256 
Bread th of infratemporal fossa (mid height) 
57 
Length of jugal * - 
290 
T.pngth of maxilla 
365 
Tipngt.h of dentition of maxilla..... 
260 
320 
350 
Length of dentarv 
545 
570 
820 
Length of mmiHihle, excluftiv© of pf^d^ntATy 
670 
Greatest height of dentary, including teeth 
133 
126 
190 
Length of dentary magazine. 
275 
300 
350 
T ,pn orth of pH on tnl our nortion of Hfsntarv. ............. 
220 
i Measurements taken from Gilmore, C. W.: Geol. Surv., Canada, Bull. 38 (1921). 
