NO. 2147. TWO EXTINCT MAMilALS FROM TEXAS— HAT. 109 



Figures 7, 8, and 9 represent plates which evidently belonged to 

 the anterior border of the carapace, that surrounding the neck. Simi- 

 lar iDlates are shown by Burmeister.^ Figures 7 and 9 present 

 views of the inferior surfaces. These are very convex from front to 

 rear and they terminate in an obtusely rounded free border. The 

 free border of figure 7 is toward the right hand; that of figure 9 

 toward the left. The bone of figure 7 has a thickness of 26 mm.; 

 that of figure 9 a thickness of 23 mm. Figure 8 gives a view of the 

 outer surface ; the free border is directed downward. The bone is 28 

 mm. thick. 



Figures G, 10, and 11 give views of plates which belonged on the 

 tail.^ From a rather thin front border, about 10 mm., these bones 

 thicken backward and end in a relatively acute point. At this point 

 the bone of figure 10 is 23 mm. thick; that of fi.gure 11, 31 mm. The 

 bone of figure G belonged to one of the rings which alternated with 

 the rings composed of such bones as those of figures 10 and 11. The 

 upper half of the figure, which represents the hinder half of the bone, 

 was evidently overlapped by such a bone as that of figure 10, while 

 the lower border joined the front edge of another bone similar to 

 figure 10. The convex pitted outer surface is shown in the lower half 

 of figure G. The bone is 16 mm. thick. 



Another plate belonging to the tail, or possibly to the borders of 

 the carapace, and resembling that of figure 11, has a thickness of 

 32 mm. at the proximal border and of 42 mm. near the hinder border. 



In the second volume of the Transactions of the Wagner Free In- 

 stitute of Science (p. 25) Dr. Joseph Leidy called attention to some 

 carapacial plates of a glyptodon which had been sent to him from 

 Peace Creek, Florida. One of these bones is illustrated on his plate 

 4, figure 9 ; another on plate 6, figure 1. The latter presents a radiat- 

 ing striation which is not seen on any of the plates from Texas. The 

 figure on his plate 4 suggests strongly some of the Texan bones, but 

 the pitting appears to be coarser. It is impossible to say whether or 

 not the Floridan specimens belong to G. petaUfey'us. Among the 

 bones of the latter species are none which resemble those of Leidy's 

 figures 11 and 12 of his plate 5. 



From the fragments of the lower jaw no information of importance 

 has been obtained. 



The length of the upper tooth line was 165 mm. These upper 

 teeth were much curved, in such a way that the outer face is concave, 

 the inner one convex. At the same time they are directed outward 

 as they ascend. The outer faces of the second teeth would have been 

 65 mm. apart at the grinding surface, about 90 mm. at the middle of 

 their height, and about 100 mm. at the upper ends. The fourth tooth 



1 Anales Mus. Pub., Buenos Aires, vol. 2, pi. 41, flg. 4. s Idem, pis. 37-40. 



