<384 THE BRIDGEK FAUNA. 



Width centrum of atlas below posteriorly 030 



Width transverse process of atlas flO 



Vertical diameter neural and odontoid canal 01.) 



Length axis to odontoid process 033 



Length odontoid process 007 



I ( with hypapophy sis 012 



Diam. centrum behind ? ^'"''l'*"*' \ without hy papophysis 009 



' transverse 0115 



Length of centrum of fifth cervical 030 



Length of centrum of seventh 01/ 



Length of centrum of second dorsal 014 



Anteroposterior diameter of base of neural spine of second dorsal 010 



Expanse of head and tubercle of first rib 012 



Fore limb. — The greater part of the blade of the scapula is lost. The 

 neck is stout, and the coracoid is a short aliform process. The humerus is 

 moderately robust, most so proximally. The greater tuberosity is a strongly 

 incurved crest, with truncate summit, which is a little elevated above the 

 plane of the head, from which it rises rather abruptly. The bicipital 

 ridges are not strong nor prominent. The olecranar fossa is deeper than 

 the coronoid fossa, and they communicate by perforation. The inner part 

 of the condyle is the largest, and forms an acute angle with the interior 

 «picondylar surface. The exterior part of the condyle is divided by an 

 oblique angle of the surface separating an external beveled band of the 

 same, which narrows to extinctiou on the posterior side. As compared 

 with the humerus of Hijrachyus eximius, that of Triplopus citbitalis is very 

 similar, ditfering mainly in two points at the distal extremity. The 

 olecranar fossa is smaller and is less excavated, and its lateral bounding 

 ridges are of unequal elevation ; in T. cubitalis they are equal. 



The ulna and radius are more than one-fourth longer than those of H. 

 eximius. Although they are entirely distinct throughout, the ulna is quite 

 slender anterior to the proximal third. The shaft is much more slender 

 than that of Hyrachyus eximius. The olecranon is compressed, deep, and 

 truncate behind. The distal epiphysis is remarkable for its length, being 

 twice as long as that of the radius. The head of the radius is subequally 

 divided by fossaj, the external being the shallower. The inferior or ulnar 

 facet is regularly and gently convex downwards, and is bounded behind 

 by a roughened ridge, which near the external border turns backwards to 

 the humeral border. The shaft of the radius is robust and flattened. The 



