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PROCEEDINGS OF THE NATIONAL MUSEUM. 



Both ulnae are preserved and the left one is wholly uninjured. 

 This may be compared with the corresponding bone of Burmeister's 

 Glyptodon asyer.^ The one of the right side is figured (pi. 4, fig. 1) 

 because with it may be shown the corresponding radius. 



Measurements of ulnae of Ghjptodonts in millimeters. 



The two bones differ little in length, but that of G. petaliferus is 

 much slenderer in all parts. A comparison of the figures show con- 

 siderable differences in the form. In the South American species 

 the middle of the surface for the articulation of the head of the 

 radius is below the middle of the length of the ulna, while in the 

 Texas species it is above the middle. The ulna of the latter is nearly 

 straight, while that of G. asper is bent downward toward the distal 

 end. 



The right radius (pi. 4, fig. 1) is complete; the left is represented 

 by the distal three-fourths. The total length of the bone is 170 

 mm.; the greatest width at the upper end is 52 mm.; the greatest 

 at the lower end 55 mm. ; the fore-and-aft diameter at the middle of 

 the length, 27 mm. ; the side-to-side diameter at this point 20 mm. 

 The total length of the radius of G. asper appears to have been 167 

 mm., while the fore-and-aft diameter was about 26 mm. The bone 

 appears to have had about the same size and proportions in the two 

 species. 



Of tlie innominate bones only fragments have been preserved. 



The right femur (pi. 4, fig. 2) is practically complete. It is here 

 compared with that of Ghjptodon asper, as figured by Burmeister,^ 

 who says that his figure is one-half the natural size. 



Measurements of femurs of Glyptodonts in millimeters. 



1 Anales Mus. Pub., Buenos Aires, vol. 2, pi. 33, fig. 



Idem, pi. 34, 



