15 
development it is more like that of the Corythosawrus and like that shown 
in T. erectofrons . It extends down to near the middle of the orbit as a 
well-developed process and it and the large lachrymal force the lower 
limb of the premaxilla well away from the orbital rim. 
The jugal is long and relatively slender as in T. erectofrons and the 
postorbital bar extends up to the top of the lateral temporal fossa and 
almost reaches the anterior tip of the squamosal. 
The sclerotic ring is fairly well preserved and suggests a very small eye 
located well up and back in the orbit. 
The maxilla is more slender than in T. erectofrons . It contains 40 
vertical rows of teeth and in most cases there are two teeth in the tri- 
turating surface. The enamel faces of the teeth are long and narrow, with 
the median carina very high at the base but low at the tip. The edges 
are almost flat and the borders are smooth. 
The dentary is massive, strongly decurved anteriorly, and the edentu- 
lous portion is short and deep. The dental magazine contains 33 vertical 
rows of teeth. It is deep and there are usually three enamel crowns 
developing below the functional tooth. This is one more than in C. 
excavatus . Except at the extremities there are one enamel crown and two 
fangs in the triturating surface. The dentary teeth do not differ greatly 
from those of C. excavatus except that the edges show less papillation. 
lambeosatjbtjs Parks 
Lambeosaurus clavinitialis sp. nov. 
Plate IV, figure 2; Plate V, figure 1 ; Plate VI 
Type. No. 8703, Geol. Surv., Canada, consists of complete skeleton 
except predentary, left quadrate, postorbital, and squamosal, dorsal 
vertebrae, left dorsal ribs, left ilium, and some distal caudal vertebrae. 
Skeleton only partly prepared. Collected by the writer in 1928. 
Horizon. Pale Beds, Belly River series, Upper Cretaceous. 
Locality. Two and a half miles south of the mouth of Berry creek, 
140 feet (aneroid) above Red Deer river, Alberta. 
Generic Characters. Hood high, variable in fore and aft length, 
thrown strongly forward, highest point in front of orbit; lower limb of 
premaxilla upturned and separating upper limb from nasal anteriorly, 
narial passage enters hood through swollen upturned lower limb of 
premaxilla; lower limb of premaxilla just barely cut off from orbital 
rim by slender process from lachrymal ; upper limbs of premaxillse separat- 
ing nasals to their posterior extremity; cranium narrow; brain-case 
strongly deflected; maxilla in front of jugal, short, heavy, and convex; teeth 
more numerous in dentary than in maxilla; ilium not strongly decurved 
anteriorly; integument made up of small scales not differentiated into 
patterns and without limpet-like bosses. 
Specific Characters . Skull and skeleton massive; hood of medium length 
(fore and aft) ; lower limb of premaxilla well developed, strongly swollen. 
