1871.] 2 1 3 [Cope. 
Lines. 
Transverse distal diameter. .....--+.sseessse eee sai eager 40.5 
oe five INCHES BDOVE.« oss es ee sacs ableges s+ ee os 30. 
The right internal metatarsus also bears considerable resemblance to H. 
foulkei. Its proximal extremity is much more convex in its inner out- 
line than in that species. The inner proximal face is plane and longi- 
tudinally wrinkled. The proximal or tarsal articular face is concave 
anteriorly ; its plane is at right angles to the axis of the shaft of the bone. 
It is strongly oblique in H. foulkei, and a rib-like prominence of the outer 
face crosses the latter obliquely and at right angles to the proximal 
extremity. No such rib exists in the present case, because the weight 
was supported by the shaft of the bone, directly and not obliquely as in 
Hadrosaurus. Thus the Hypsibemas walked more exactly on the toes 
than did the Hadrosauri. 
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. Lines. 
Length from antero-superior to postero-inferior, 10 10 
Extremity (inferior articular face worn away), 
Traverse diameter proximally.......-.+-+++-> 3 
a - Medially... 6100s. 5 vena 2 3.5 
Antero-posterior diameter medially......-.---++--- . 3 6. 
The diameters of the shaft are somewhat larger than in the FH. foulkei 
given by Leidy, 
The caudal vertebra is of large size and peculiar form. The centram is 
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 medially. _ A 
marked peculiarity is seen in the strong longitudinal ridge which divides 
the lateral surface of the vertebra into two nearly equal faces. The 
neural arch is elongate, the neural canal small: in section a short vertical 
ellipse. The articular face of the zygapophyses makes an angle of about 
thirty-five degrees to the perpendicular. The crest of the arch rises a 
half inch behind these into the very stout basis of the neural spine, the 
. greater part of which, with the posterior zygapophyses, is broken off. 
The inclination of the base is about 65° to the vertical diameter of the 
bone, The articular faces are both slightly concave, as are the lateral 
faces which are separated by the lateral ridge. 
In. Lines. 
Length of centrum. .......-++-er seer cere tee ; 4 6 
es basis Of MEULALALCly cys iets bee ee yee 2 9 
Width posterior articular face.....--+.+.e..ees 4 
