APPENDIX. 
Associated with them are several coprolites of large animals. 
These species indicate an animal of about the size ot the Hadrosaurus 
foulkei, Leidy, and with a similar disproportion in the lengths of the 
limbs. This is readily appreciated on comparison of the huge metatarsus 
with the light humerus. The medullary cavity of the tibia is large; that 
of the humerus small. 
The portion ot the humerus preserved is injured, and the condyles are 
worn. Its relation to that of H. foulkei is readily determined, and on 
comparison the following marked differences appear : The ridge connect- 
ing the external condyle with the shaft posteriorly is acute ; it is rounded 
in II. foulkei. External distal face is flat or slightly concave ; in II. foulkei 
somewhat rounded. It is at right angles to the plane of the anterior lace, 
and forms with it rather less than a right angle ; in II. toulkei this region 
is rounded. Distally the shaft is much flattened in II. crassicauda. 
Measurements. 
Lines 
Antero posterior diameter of shaft, just above condyles, 20.5 
Width external face distally, 24 
“ olecranar fossa, 10 
“ condyles, (estimated) 64 
The anterior face at over three inches above the condyles is slightly con- 
cave. About 4.5 inches above the articular face of the external condyle, 
the acute ridge dividing the posterior and external faces disappears, and 
the surface becomes regularly rounded. 
The portion of the tibia is from the shaft of that of the left side, just 
below the superior antero-posterior expansion. Therefore the inner face 
is the most extensive, and the posterior the least so. It differs from the 
same part in II. foulkei, in its less angularity, especially in the more 
rounded, and less defined posterior face. The internal face narrows down- 
wards, and while the greatest diameter of the fragment above is antero- 
posterior, below it is diagonal, the anterior point being the inner. 
Measurem ents. 
Lines. 
Antero-posterior diameter above, 48 
Transverse “ “ 22.5 
“ “ medullary cavity, 20.5 
The portion ot fibula is the distal, and resembles that of Hadrosaurus 
foulkei, in being slightly expanded near the extremity, and clyindric in 
the lower part of the shaft. In both genera and Ornithotarsus, Cope, the 
distal extremity of the fibula is less attenuated than in Iguanodon. 
