18 
pointed, thicker, and less strongly decurved, In its posterior portion it 
resembles Hypacrosaurm altispinits Brown (1, Figure 4), but its anterior 
process is more like Edmontosaurus regalis Lambe, though not triangular 
in cross-section as in that species. The internal face of the preacetabular 
process is moderately flat, so far as seen, and at a point near its mid- 
length it is 40 mm. thick. The process that overhangs the ischiac peduncle 
is farther forward than in Corythosaurus, massive and well buttressed from 
below. In its posterior portion it extends only slightly beyond the buttress, 
but the anterior edge overhangs and blends in with the slightly rolled 
superior margin of the bone. 
The pubis is broadly rounded in front and less constricted in its nar- 
rower part than in Corythosaurus. The peduncle for union with the ischium 
is of moderate length and narrow and there is a narrow notch between this 
peduncle and the postpubis. The postpubis is long and well developed. 
It is 55 mm. wide at the base, from which point it gradually decreases in 
breadth. 
The ischium is slightly sigmoid in outline and more massive than in 
Corythosaurus. The proximal end is broad and the pubic articulation is 
much broader than the pubic peduncle. The antero-inferior edge is 
straight for a distance of 260 mm. and near the centre of this is a well- 
developed ischiatic notch which is partly closed by the forward develop- 
ment of the edge of the bone behind the notch. The antero-inferior edge 
of the bone behind the notch unites with that of the opposite ischium. This 
union appears to be natural, though it may be partly due to crushing. In 
its proximal portion the postero-superior edge of the ischium is moderately 
thin, but about one-third distant from the proximal end this edge expands 
into a broad, flat surface and from here distally unites with its fellow. The 
greatest thickness of the postero-superior edge of the ischium is about one- 
third distant from the proximal end, where it measures 64 mm. The antero- 
inferior portion of the bone at this point is 35 mm. in thickness. The 
antero-superior edge is quite thick just behind the ischic notch, but the 
rest of this edge of the bone is gently rounded and it does not unite with 
the opposite ischium except in its distal one-third. The narrowest point 
is beyond mid-length of the bone. The foot-like expansion is moderately 
developed and the end is thickened, especially anteriorly. 
The femur is relatively short. This shortness is not clearly shown in 
the drawing because crushing of the greater trochanter has exaggerated the 
length. It is believed that in life this bone was little longer than the tibia. 
The proximal end of the bone is broad and the greater trochanter as pre- 
served stands about 60 mm. above the head of the femur. The fourth 
trochanter is strongly developed and located well down on the bone. The 
distal condyles are developed well backward, giving a very long articulat- 
ing surface. The fore and aft width of this distal end (over condyles) 
measures 270 mm. 
The tibia is massive throughout and is almost as long as the femur. 
The cnemial crest is strongly developed and extends much farther down 
the anterior face of the bone than in Corythosaurus. In this respect it 
closely resembles the tibia of Hypacrosaurus altispinus. In fact the whole 
limb resembles Hypacrosaurus more than Corythosaurus . The proximal 
end of the tibia is 300 mm. in fore and aft diameter, and at a point 300 mm. 
