RHYNCHIPPUS EQUINUS 



99 



number has not been definitely fixed. Typical lumbars 

 measure as follows: 



Lumbar 2, length of centrum 



Lumbar 2, height from base of centrum to spine 



Lumbar 4, length of centrum 



Lumbar 4, height from base of centrum to spine 



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 

 natural size. 



JY 



Fig. 59. Right front foot 1/2 

 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 II mm. 



The carpus is carefully drawn, from which the various 

 measurements may be obtained. There is a tendency for 



