EXPLORATION IN ALASKA IN 1907 G1LM0RE 33 



This is the largest of the extinct bisons found in the deposits of 

 this region, and a scapula (see fig. 4) collected by the writer at the 

 "Palisades" on the Yukon River may, on account of its size, pertain 

 to this species. Plate x represents a typical skull of this form col- 

 lected on Little Minook Creek and presented to the Smithsonian 

 Institution through the writer by Mr. J. B. Duncan, of Rampart, 

 Alaska. 



BISON ALLENI Marsh 



Bison alleni Marsh, Amer. Jour, of Science, vol. xiv, 1877, p. 252. 



Type. — Horn core, No. 911, Museum of Yale College, New 

 Haven, Connecticut, from Blue River, near Manhattan, Kansas. 



Description. 1 — "Horn cores long, slender, much curved, slightly 

 flattened above at base; transverse diameter considerably greater 

 than vertical ; length along upper curve much greater than circum- 

 ference at base. Bison alleni is distinguished from B. crassicornis 

 by the much greater curvature of the horn cores, these being also 

 more flattened and more elliptical in section in crassicornis. 



Remarks. — This species is represented in the U. S. National. 

 Museum paleontological collection, by a skull, No. 2383, from Little 

 Minook Creek, near Rampart, Alaska. 2 It (see pi. xi) was found in 

 the frozen muck twenty-five feet below the surface, and is of more 

 than usual interest on account of the excellent state of preservation 

 of the horn sheaths and from its being the first of this species found 

 in. Alaska. This species is also reported as occurring in Idaho. 



A skull of B. alleni from the Porcupine River is now in the Grand 

 Rapids Museum, of Grand Rapids, Michigan. 



BISON OCCIDENTALS Lucas 



Bison occidentalis Lucas, Science, November 11, 1898, p. 678. 



Type. — Portion of skull with horn cores, No. 4157, U. S. National 

 Museum, from Fort Yukon, Alaska, collected by Sir John Richard- 

 son. 



Description. — "Horn cores moderate ; circumference at base 

 equal to or slightly greater than length along upper curve ; sub- 

 circular in section, regularly curved upward and backward." 



1 The descriptions of the Bison from Alaska is taken from Mr. F. A. Lucas' 

 article, "The Fossil Bison of North America." Proc. U. S. National Museum, 

 vol. xx, 1899, pp. 755-771. 



2 This specimen was presented to the Museum by Messrs. McLain and Bal- 

 lon, of Rampart, through the efforts of Gen. Timothy Wilcox, U. S. A., of 

 Washington, D. C. 



3a 



