152 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



thin longitudinal carina. In height and shape the neural canal of 

 this vertebra conforms to its position between the anterior dorsal 

 and the anterior lumbar vertebrae. 



Measurements of vertebrae (in millimeters) 



Greatest anteroposterior diameter of centrum 

 Greatest vertical diameter of centrum 

 Greatest transverse diameter of centrum 

 Greatest vertical diameter of neural canal 



anteriorly 34. 32. 5 22. 



Greatest transverse diameter of neural canal 



anteriorly 27. 18. 5 17. 



Least anteroposterior diameter of pedicle of 



neural arch 13. 23. 5 24. 5 



Distance across vertebra between outer ends 



of diapophyses 68. 



Distance across vertebra between outer ends 



of transverse processes 56. + 



Greatest distance between outer margins of 



prezygapophysial facets 36. 



Greatest distance between outer margins of 



postzygapophysial facets 29. 5 



1, anteriorly; 2, both epiphyses missing; 3, posteriorly. 



FORELIMB 



The forelimb is represented by the left ulna, an incomplete proximal 

 end of the radius (pi. 18, fig. 5), one carpal bone (pi. 18, fig. 6), and one 

 phalange (pi. 18, fig. 7). On the proximal end of the radius, the articu- 

 lar surface for the humerus is depressed medially and rounded off 

 internally and the shaft is compressed from side to side, but the facet 

 for articulation with the ulna is broken off. The length of the phalange 

 is 33 mm., the minimum anteroposterior diameter of the shaft 20 mm., 

 and the thickness 7 mm. The measurements of the carpal bone are: 

 Transverse diameter, 27 mm.; vertical diameter, 24.5 mm.; and maxi- 

 mum thickness, 13 mm. 



ULNA 



The shaft of this left ulna (pi. 18, fig. 4) is quite straight, not notice- 

 ably compressed from side to side, and almost elliptical in cross section 

 near the middle of its length. Although the distal end is broken off, 

 the curvature of the anterior and posterior faces indicates considerable 

 expansion distally. The posterior edge of the shaft is rather sharp, 

 while the somewhat rounded anterior face has a shallow groove com- 

 mencing about 15 mm. below the radial facet and becoming deeper 

 distally. The olecranon is rather large and well developed, pointed 

 dorsally and prolonged ventrally, and its posterior edge is nearly 



