6 Proceedings of the Biological Society of Washington . 



This species is named in honor of Colonel Theodore Roosevelt, in rec- 

 ognition of his services in behalf of the natural history of mammals, and 

 especially in recognition of his contributions to a knowledge of Alces 



Fig. 1, — Cervalces roosevelti. Part of skull and part of right antler, x.186. 



americanns, the American Moose, the living representative of the animal 

 here described. 



Aftonius gen. no v. 



A genus belonging to the Bovid;e. Horn-cores laterally compressed, 

 without definite keel in front; strongly curved backward, then straight- 

 ening and turning somewhat inward. Frontal bone with large sinuses at 

 the base of the pedicels of the horn-cores. Type, Aftonius calvini, new- 

 species. 



Aftonius calvini sp. nov. 



Type two horn-cores of same individual, found at Missouri Valley; 

 Harrison County, Iowa, in Pleistocene deposits of the Aftonian stage. 



The horn-cores here described were mentioned and one of them was 

 figured* by Prof. Samuel Calvin in 1909; but this author did not attempt 

 * Bull. Geol. Soc Amer., Vol. XX, pp. 350-351, pi. xxiii, fig. 1, 



