20 
folding of the integument in this region. The tubercles are somewhat 
larger than those on the flank, but they are not differentiated into patterns 
and no limpet-like bosses are discernible. 
It would seem most likely that if limpet-like bosses or differentiation 
into patterns were present in Lambeosaurus there would be some sign of 
them in the parts of the integument preserved in this specimen. 
Lambeosaurus magnicristatum sp. nov. 
Plate VII 
Type. No. 8705, Geol. Surv., Canada, consists of skull and greater 
part of skeleton except left manus and part of forearm, right fore limb, 
ribs from right side, and some distal caudals. Skull and right ilium only 
have been prepared. Collected by the writer in 1919. 
Horizon. Pale Beds, Belly River series. 
Locality . About 3 miles southwest of mouth of Little Sandhill creek, 
near top of beds. 
Specific Characters. Skull moderately massive; hood very long, high 
and thin superiorly; facial slope gentle anteriorly, then very sharply up- 
turned and thrown strongly forward; upper part of premaxilla expanded 
to cover narial slit far forward; upper limb of premaxilla developed into 
very high, thin crest above narial passage; up-turned lower limb of pre- 
maxilla very large, strongly swollen and thrown sharply forward; diagonal 
groove across lower limb not well defined; nasal extending backward as 
narrow process to flank premaxilla posteriorly; orbit broadly rounded 
superiorly ; prefrontal well developed and flanking lower limb of premaxilla 
and tip of nasal ; ilium of light construction, moderately down-curved and 
thin interno-externally. 
At first sight the skull reminds one of a glorified Corythosaurus 
casuarius , but on closer examination it is seen that the greater part of the 
long, high crest is made up of the upper limbs of the premaxillge and that 
they separate the nasals to their posterior extremity. Also the narial pas- 
sage enters the hood through the large, swollen, forwardly bent lower limb 
of the premaxilla. As these characters are typical of Lambeosaurus it is 
referred to that genus even though the crest or hood is so different from that 
expected. The hood is thick through the up-turned lower limbs of the pre- 
maxillae and the nasals, but above this it is very thin. 
The premaxilla is strongly developed and the upper limb bends so far 
forward as to overhang the beak. It is high, very long, and very thin 
throughout. This upper limb does not enclose the narial passage, though 
it comes in contact with it superiorly and may divide the two as it does in 
L. lambei. The upper edge of the anterior portion of the premaxilla is 
much broader than in L. clavinitialis and covers the narial passage far for- 
ward. The suture between the upper limb of the premaxilla and the 
anterior tip of the nasal is not positively determinable because much of the 
crest was preserved in a thin layer of carbonaceous shale and the bone 
was not well preserved. This suture is tentatively placed near the anterior 
tip of the lower limb of the premaxilla. The division between these bones 
farther back is well defined. Some of the centre of the thin crest had to 
be restored because the bone, though present, was too rotten to save. The 
