92 DINOCERATA. 



m. 



Transverse diameter, through condyles, ._ 200 



Transverse diameter of trochlear surface, __ .127 



Antero-posterior diameter of trochlear surface, ulnar side, .109 



Antero-posterior diameter of trochlear surface, radial side, .091 



Antero-posterior diameter of trochlear surface, least, 078 



Thickness of bone between eoi'onoid and anconeal fossae, .-' .016 



3Ieasuremenis of Left Humerus. [Di/wreras mirafnle, No. 1208.) 



m. 



Least antero-posterior diameter of shaft, _ ,.- . . .064 



Transverse diameter, through condyles, __.. .184 



Transverse diameter of trochlear surface, . . _ _ . _ .124 



Antero-posterior diameter of trochlear surface, ulnar side, .100 



Antero-posterior diameter of trochlear sxirf ace, radial side, . .095 



Antero-posterior diameter of trochlear surface, least, . . .080 



Thickness of bone between coronoid and anconeal fossae, .Ola 



Measirronenis of Jiight I/iimrrus. [T>i)ioccras 7n!r<iblle, No. 1212.) 



m. 



Least antero-posterior diameter of shaft, 058 



Transverse diameter through condyles, . .183 



Transverse diameter of trochlear surface, .115 



Antero-posterior diameter of trochlerir surface, ulnar side, 098 



Antero-posterior diameter of trochlear surface, radial side, .080 



Antero-posterior diameter of trochlear surface, least, _ .072 



Thickness of bone between coronoid and anconeal f ossa>, . _ .014 



Measttreiuents of lUglt Ifumerus. [Dinoceras mirabile, No. 1215.) 



m. 



Antero-posterior diameter of head, _ .140 



Transverse diameter of head, 138 



Greatest diameter of proximal end, .220 



Antero-posterior diameter of trochlear surface, ulnar side, .116 



The Forearm. (Plates LV and LVI.) 

 Tlie two bones of tlie tbrearni in the Blnocerata are quite distinct 

 throughout in all the specimens observed, and, exclusive of the olecranon 

 process of the idna, differ but little in size. The articular surface for the 

 humerus is formed in about equal parts by each bone, except that it is 

 medially ])roduced backward on the ulna upon the beak of the olecranon. 

 The distal articular face fen* the carpus was borne more b}' the radius 

 tlian the ulna, but the iuecpiality, in size, of the articular faces was 

 comparatively slight. The lunar articulated distinctly with both bones. 



