35 
DESCRIPTION OF THE TYPE OF LAMBEOSAURUS 
Lambeosaurus lambei Parks 
PLATES VI, VII, VIII, AND IX 
Stephanosaurus marginatus, Lambe, L. M., Ottawa Naturalist, vol. 28, 
April, 1914, pp. 17-20, PI. I (in part): Geol. Surv., Can., Mem. 120, 1920, 
pp. 68, 74 to 76, Fig. 39 H (in part). 
Lambeosaurus lambei Parks. University of Toronto Studies, No. 15, 
1923, p. 7. 
Type: No. 2869, Geol. Surv., Can., consists of a fairly complete skull 
and right ramus. Collected by C. M. Sternberg, 1917. 
Locality: 4 miles southwest of the mouth of Little Sandhill creek, 
Red Deer river, Alberta, 100 feet below contact with the Pierre. 
Referred Specimens: 351, Geol. Surv., Can., consists of the left half of 
skull, both dentaries and predentary, both femora, both tibiae, one fibula, 
both ischia, and 5 metatarsals. Collected by C. H. Sternberg, 1913. 
Locality: Sec. 20, tp. 21, range 11, W. 4th mer., 3| miles southwest of 
the mouth of Berry creek, Red Deer river, Alberta. 
No. 8508: Geol. Surv., Can., consists of the nearly complete skull 
with much of the skeleton. Only the skull has been prepared at this time. 
Collected by C. M. Sternberg, 1917. 
Locality: Sec. 25, tp. 20, range 11, W. 4th mer., 3£ miles west of 
south of Little Sandhill creek, Red Deer river, Alberta. 
Horizon: All three specimens from the Belly River formation, Upper 
Cretaceous. 
Generic and Specific Characters: Skull comparatively short, with a high, 
narrow crest bearing a long, narrow, posterior prolongation that overhangs 
the occiput, both crest and prolongation being formed by the premaxillaries 
and nasals. Highest point of crest falling in front of orbit. Premaxillaries 
extending to extreme posterior tip of crest. Beak narrow, nares in beak 
open. Maxilla very short between anterior jugal articulation and entrance 
to infraorbital foramen, 38-39 vertical rows of teeth. Lachrymal greatly 
reduced. Quadrate relatively short. Mandible strongly decurved in 
front. Dentary with 40 to 41 vertical rows of teeth. Teeth long and 
relatively narrow, borders papillate. 
Description 
The specimen selected as the type of Lambeosaurus lambei has been 
described 1 to some extent by Lambe, but it seems desirable that these 
descriptions should now be somewhat elaborated and revised in order to 
incorporate in this one article all information concerning this highly interest- 
ing reptile. I shall, however, whenever possible, quote directly and fully 
from Lambe’s descriptions, though reserving the right to change the order 
in which they were arranged in the original articles. Reference is occasion- 
ally made to other individuals when important structural details or modi- 
fications are displayed, but the description, as far as possible, is based 
entirely on the better preserved type specimen (No. 2869, Geol. Surv., 
Can.). 
1 Ottawa Naturalist, vol. 28, April, 1914, pp. 17-20, PI. I; Geol. Surv., Can., Mem. 120, 1920, 
pp. 74-75, text fig. 39 H. 
