34 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5 1 



Remarks. — A second specimen, No. 2643 (sec pi. xn), in the U. S. 

 National Museum collections, was collected by Mr. A. G. Maddren 

 on the Old Crow River in 1904. A fairly complete skeleton 1 of this 

 species from Gove County. Kansas, is now in the University of Kan- 

 sas Museum. This species has also been reported as occurring on 

 the Tatlo River and St. Michaels. Alaska. The writer doubts very 

 much the authenticity of this last locality. Mr. Lucas says: "It is 

 the species most nearly resembling the existing bison, with which it 

 was probably for a time contemporaneous." In that event B. crassi- 

 cornis was also a contemporary, as the writer recognized skulls of 

 B. occidcntalis and B. crassicornis at Fox Gulch, on Bonanza Creek, 

 coming from the same layers in the deposits there. 



BISON PRISCUS (?) 



A skull collected at Eschscholtz Cay. Alaska, was provisionally 

 referred 2 to this species by Sir John Richardson. In a more recent 

 paper. 3 however, Mr. F. A. Lucas has considered this specimen (No. 

 24,589. British Museum) as representing an immature individual or 

 "spike horn" of B. crassicornis. 



Horn cores collected by Maddren on the Old Crow River and by 

 the writer at the "Palisades" on the Yukon River appear to resemble 

 the figure (see pi. xni, fig. 3) given by Richardson in his report. 



SYMBOS TYRRELLI Osgood 



Scaphoceros tyrrelli Osgood, Smithsonian Miscellaneous Collections, vol. 



xlviii. No. 1585. 1905. pp. 173-183. pi. xxxvii, fig. 2; pi. xxxviii, fig. 



2; pi. xxxix. fig. 1 ; pi. xl, fig. 2. 

 Symbos tyrrelli OSGOOD, 



Type. — Fairly complete skull, Xo. 2555, U. S. National Museum, 

 from Lovett Gulch, Bonanza Creek, Klondike District, Yukon Terri- 

 tory, Canada (see map, plate ix). 



Description — Generic characters.* — "Similar to Ot'ibos, but horn 

 cores much smaller, less compressed at base, and more divergent at 

 tips ; crown of skull between bases of horn cores surmounted by a 

 prominent exostosis with an anterior bounding rim and a deep 

 median excavation ; orbits much less produced laterally than in 



1 Stewart, Alban : Kansas University Quart., July, 1897, Sec. A, pp. 127-135. 

 Described as B. antiquus, but referred later by Lucas to B. occidentalis. 



2 Richardson, Sir John: Zoology of Voyage of II. M. S. Herald, 1852-54.pl. 

 Vii, fig. I, p. 34. 



8 Lucas, F. A.: The Fossil Bison of North America. Proc. U. S. Xat. Mus.. 

 vol. xxi, 1899, p. 762. 

 * Generic and specific characters as given by Osgood. 



