100 Proceedings of the Biological Society of Washington. 



The occiput of the last mentioned skull is more inflated than in 

 the others and the vertex lies in front of the foramen magnum. 

 I believe that this skull belongs to E. columbi, as that species has 

 been recognized. 



The skull from Dallas, Texas, presents another and very dif- 

 ferent type of architecture. It is very narrow and very low, the 

 height being only 84 percent of the unit of length, and the occiput 

 is flat. This skull appears to me to be referable to E. imperator. 

 The three fine skulls in the American Museum belong to three 

 distinct species. 



That the elephants which now bear the name Elephas horeus 

 are specifically different from those which have been called E . 

 columbi is indicated likewise by the geographical distribution of 

 the two forms. Elephas horeus is abundant in the glaciated 

 region of our northern States and Canada and around the 

 glacial border, but extremely rare in the southern States. E. 

 columbi is abundant southward and especially on the western 

 plains; but it is not so often found in the glaciated region as is 

 E. boreus. 



Professor Osborn in his paper of July 8 has published an 

 interesting figure of upper teeth of an elephant (his fig. 8) found 

 in Indiana. On plate LIX of the twenty-third volume of the 

 Iowa Geological Survey, I published a figure of very similar 

 teeth found at Milwaukee, Wisconsin, and preserved in the Pub- 

 lic Museum of that city. The hindermost molar had just begun 

 to suffer wear. In the U. S. National Museum are right and 

 left hindermost molars (No. 2195) of similar form, found at Ash- 

 land, Cass County, Illinois; also an upper left hindermost molar 

 (No. 4761) hardly different, discovered in Wayne Township, 

 Darke County, Ohio. The pecuharity of all these teeth is the 

 low elongated form and the approximate parallehsm of the upper 

 and the lower borders. Inasmuch as the molar descends at 

 a nearly right angle with the grinding face of the tooth in front 

 it seems probable that the skull was short. Professor Osborn 

 has referred his specimen to Elephas primigenius; but I find no 

 teeth from Alaska or the Old World which present similar 

 characters. I believe that a hitherto unrecognized species is 

 indicated. This I propose to call Elephas roosevelti in honor of 

 another statesman and naturalist, one whose multifarious inter- 

 est led him to pursue living elephants in their African wilds. 



