Al’l’KNmx. 
38 
Lines . 
Transverse distal diameter, 40.5 
do. five inches above. 30 
The right internal metatarsus also bears considerable resemblance to 
that of H. foulkei. Its proximal extremity is much more convex in its 
inner outline than in that species. The inner proximal face is plane and 
longitudinally wrinkled. The proximal or tarsal articular face is concave 
anteriorly ; its plane is at right angles to the axis ot the shaft of the bone 
It is strongly oblique in Hadrosaurus foulkei, and a rib-like prominence 
■ot the outer face crosses the latter obliquely and at right angles to the 
proximal extremity. Ho such rib exists in the present casecause, be the 
weight was supported by the shaft bone, directly and not obliquely as in 
Hadrosaurus. Thus the Hypsibemse walked more exactly on the toes 
than did the Iladrosanri. 
The posterior margin is thinner, and as in H. foulkei, presents a rather 
small median protuberance. The distal condyle is broken away, but the 
twist- of the distal portion of the shaft shows that it was directed away from 
.the adjoining metatarsal, posteriorly. 
Measurements. 
In. Liru 
1 Length from antero-superior to postero-inferior extremity 
(inferior articular face worn away), 10 10 
’’Transverse diameter proximaliy, 3 
“ medially, 2 3.5 
Amtero-posterior do. do., 3 6 
The diameters ot the shaft are somewhat larger than in the H. foulkei 
: given by Leidy. 
The caudal vertebra is of large size and peculiar form. The centrum 
bis considerably wider than deep, and considerably longer than wide. The 
posterior .chevron articulations are small, and each is connected with 
each anterior by a strong rounded angulation. Between the latter the 
space is wide and slightly concave in transverse section, least so me- 
nially. A marked peculiarity is seen in the strong longitudinal ridge which 
divides the lateral surface of the vertebrae into two nearly equal faces, 
The neural arch is elongate, the neural canal small, in section a short very 
tical ellipse. The articular face of the zygaphophyses makes an angle of 
about thirty-five degrees to the perpendicular. The crest ot the arch rises 
a half inch behind these into the very stout basis ot the neural spine, the 
- greater part of which, with the posterior zygapophyses, is broken off. The 
inclination of the base is at about 65° to the vertical diameter’ ot the bone 
