A FURTHEE AND DETAILED DESCRIPTION OF THE 

 TYPE OF ELEPHAS ROOSEVELTI HAY AND DESCRIP- 

 TIONS OF THREE REFERRED SPECIMENS 



By OiAV^R P. Hay 



Associate of the Carnegie Institution of Washinriton 



1. DESCRIPTION OF THE TYPE SPECIMENS 



In 1922^ the writer characterized briefly a species of elephant to 

 which he applied the name Elephas roosevelH. As the type of this 

 species were taken the right upper and lower hindmost molars of 

 an elephant found in 1901 at Ashland, Cass County, Illinois, and 

 now in the United States National Museum. The catalogue number 

 is 2195. In 1923 ^ these teeth were mentioned under the name Elephas 

 primigemiif , for the reason that Publication 322 Avas already in 

 press when the name E. roosevelti was proposed. 



The teeth are well j)reserved, but not without deficiencies. They 

 had not been long in use, being worn back to about the twelfth ridge- 

 plate, but not to the base in front. The upper tooth (pi. 1) lacks 

 probably two or three of the hindmost plates. The lower tooth 

 (pis. 2, 3) has lost apparently two or three front plates and one or 

 two hinder ones. Both teeth are yet mostly covered with a layer 

 of cement. The roots consisted of only a thin layer of dentine over 

 the large pulp and were destroyed in exhumation of the specimen. 

 The front roots of the upper tooth appear to have supported 3 ridge- 

 plates. In the lower tooth one plate remains of those supported 

 by the front root. 



The extreme diagonal length of the upper tooth in its present 

 state is 305 mm. ; the length along the base on the outer face is 275 

 mm. ; originally it was not far from 290 mm. The height between 

 the first and second thirds of the length, taken at right angles with 

 the base, is 172 mm. The tliickness at the same place is 90 mm. 

 The inner face of the tooth is convex in the front half, concave in 

 the hinder half. The outer face is convex. There are present 23 



1 Proc. Biol. Soc. Washington, vol. 35, p. 100. 



2 Pub. 322, Carnegie Inst. Wash., p. 141. 



No. 2571.— Proceedings U. S. National Museum. Vol. 66, Art. 34. 



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