17 
The dentary does not seem to differ greatly from that of L. lambei , 
but the teeth are slightly broader near the centre, thus giving them a more 
pointed appearance, and they are slightly notched below. This notching 
is not well pronounced as in the Hadrosaurinae, but the point of the 
succeeding tooth fits directly below the enamel crown rather than over- 
lapping it as in the former species. 
SKELETON 
The fore limb and the pelvic arch with the femur, tibia, and fibula 
have been prepared, and a section containing the base of the tail has been 
opened. These with field notes give a fair idea of the more characteristic 
parts of the skeleton. It is slightly smaller than the type of Corythosaurus 
casuarius, but somewhat larger than the type of Lambeosaurus lambei. 
Field measurements give a total length of 3,000 mm. for the presacral 
vertebrae and 950 mm. for the scapula and coracoid. The greatest breadth 
of the scapula is 203 mm. 
The humerus is relatively shorter than in Corythosaurus t as seen by 
the table of comparative measurements, but is of massive proportions. 
The radial crest is of about the same relative length as in Corytho- 
saurus , but is heavier. The width of the bone through the lower end of the 
radial crest is one-third its total length. It is difficult to give measure- 
ments of the fore limbs that indicate their relative proportions since most 
specimens are more or less crushed. Reference to Plate Y, figure 1, which 
is a photograph of the left limb and the right manus and part of the fore- 
arm, gives a good concept of the bones. 
The radius and ulna are much longer than the humerus, as is usual in 
the subfamily. They are of much heavier construction than in Corytho- 
saurus , especially so when compared with C. intermedius. The olecranon 
process of the ulna is injured so there is some question as to the exact 
length of this bone, but otherwise the bones are splendidly preserved. 
The manus is proportionately heavier than in Corythosaurus and the 
digits when compared with the metacarpals are longer, especially II and V. 
Metacarpal II is shorter than III or IV, but digit II is the longest of the 
series. Metacarpal III does not reach the same height, proximally, as II 
and IY, but it extends well beyond them distally. The foot is very similar 
to that of Parasaurolophm walkeri Parks (13, Plate YIII) but the phalanges 
are slightly longer. The proximal end of Metacarpal Y is fully as large as 
that of any of the other metacarpals and this digit is much longer than in 
Corythosaurus. The phalangeal formula is the same as in Parasaurolophus 
and only digits II and III bore hoofs. The triangular form of phalanx 2 
of these digits would suggest that these two toes would be turned in toward 
the body when in use. 
Plate YI is a drawing of the pelvic arch and hind limb of the right 
s ie. Breaks and crushing of the bones are shown as such and portions of 
the arch that are hidden by the femur are indicated by the dotted line. The 
edge of the left ischium shows below the other, but otherwise only the 
bones from the right side are shown. 
The ilium is very different from that of any previously described 
member of the Lambeosaurinae. The postacetabular portion is broader 
than in Corythosaurus (2, Plate XIV) and the preacetabular portion is less 
3312— s 
