RHYNCHIPPUS EQUINUS 99 
number has not been definitely fixed. Typical lumbars 
measure as follows: 
Lumbar 2, length of centrum 29 mm. 
Lumbar 2, height from base of centrum to spine 65 mm. 
Lumbar 4, length of centrum 3r mm, 
Lumbar 4, height from base of centrum to spine 57 mm. 
There is nothing to represent the 
sacrum or caudals. 
Only the lower half of the humerus 
is preserved and that with specimen 
3191, and it measures: 
Humerus, diameter of shaft 22 mm. 
Humerus, greatest width of distal end 46 mm. 
Humerus, width of trochlea 36 mm. 
Fig. 58. Humerus—1/2 Fig. 59. Right front foot—1/2 
natural size. natural size. 
The distal ends of the radius and ulna are preserved in 
specimen 3291, as they were found in association with the 
carpus. ; 
Radius, diameter of the distal end 29 mm. 
Ulna, diameter just above styloid process 21 mm. 
Ulna, diameter of styloid process Il mm. 
The carpus is carefully drawn, from which the various 
measurements may be obtained. There is a tendency for 
