NO. 2 



EXTINCT HORSE FROM ALASKA HAY 



It has been suggested to the writer that the skull here described 

 might belong to Equus przevalskyi. The thought readily suggests 

 itself that this horse of eastern Asia might have crossed, with many 

 other species of mammals, into America at a time when Bering 

 Strait was temporarily abolished and that later it became extinct in 

 this country. However, the Alaskan horse differs in many ways 

 from Equus przevalskyi. The teeth are of practically the same size 

 in the two forms, but the enamel of the Asian species has a still less 

 complicated arrangement. The upper incisors are 

 narrower and are curved more strongly down- 

 ward. It is the writer's opinion that the horses 

 and the bisons, probably also the mammoths and 

 many other species, found in Alaska, became ex- 

 tinct about the middle of the glacial epoch. 



They probably flourished during the Aftonian 

 and the Sangamon stages. (CO\tf\" 



In the U. S. National Museum are various teeth \j Aj 

 and fragments of jaws from Alaska. One lot of i ^cfv^ ^ 

 these (Cat. No. 2313, U. S. National Museum) vi)3 



consists of a part of the right maxilla, with the JJcc&F 



three molars (fig. 2). It was collected on Quartz 

 Creek, in the Seward peninsula, by A. H. Jose, 

 and presented to the U. S. Geological Survey. 

 The localitv is indicated on the map here pre- F }s- 2 - Three upper 



J tr sr molars of right side, 



sented (fig. 1) by the numeral (1). For an Mu S 23 x 3 | u ' s ' Nat ' 

 account of this locality see Mr. A. T. Collier, 

 in Professional Paper, No. 2, U. S. Geological Survey, page 2j. 

 These teeth, also, the writer refers to Equus niobrarensis alaskce, 

 but they present some differences. The following are the dimensions : 



Measurements 



Molar series, length 58 



M.\ height 24 



length 26 



width 26.5 



protocone 13 



M. 2 , height 51 



length 25 



width 25 



protocone 15 



M. 3 , height 5§ 



length 28 



width 24 



protocone 15 



