A. M. Spurgin 83 



I was unable to obtain a young animal, all the teeth at my disposal 

 were more or less worn, and if there had been enamel on the teeth at 

 eruption it had been worn oft'. 



Although no enamel is present on the adult teeth of any of the living 

 Edentates, the fossil forms Progmegatherium and Promylodon, from 

 the infra-Pampean beds of Argentina, have been distinguished by 

 Ameghino from the Megatherium and Mylodon as possessing bands of 

 enamel. Burmeister, 91, however, who has also worked on the fossils 

 of this region, disputes Ameghino's statement. Flower (91, p. 204), 

 states that some Glyptodonts occurring in South American beds of an 

 earlier age than the Pleistocene have enamel bands on the teeth. I con- 

 sider this fact of great weight in showing a possible connection between 

 the Glyptodonts and the living armadillos through the fossil Chlamy- 

 dotherium, whose teeth resemble those of the Glyptodonts, but have no 

 enamel. 



University of Texas, Austin, Texas, May 15, 1903. 



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