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THE ameeica:n bisoxs. 



are given in the subjoined table differ from the atlases of domestic cattle 

 in the very much greater size of the articular cup, and in the form of the 

 pleurapophyses or "wings" of the atlas. 



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TABLE I. 



# 





Measurements of Atlases. 



TraDS verse axis of brim of articular cup 



Sterno-dorsal " " " - 



Transverse axis of post-articular surface 



Greatest transverse breadth of atlas 



Greatest breadtli sterno-dorsally of distal end of atlas 



Greatest length near the lateral edge of wing 



Lenc^th of centrum, mesial line of sternal aspect 



" " " dorsal " 





1 



133 



2 



137 



3 



4 



1 



5 



6 



7 



8 



118 



133 



128 



115 



117 



118 



70 



65 



62 



60 



54 



57 



61 



53 



136 



126 



130 



119 



112 



102 



128 



114 



240 



215 



227 



200 



* fl • • 



170 



237 



204 



100 



90 



116 



96 



« 4 * B 



85 



105 



97 



127 



120 



130 



115 



« 4 * * 



110 



135 



116 



59 



51 



50 



55 



54 



50 



53 



47 



84 



58 



75 



60 



« 4 • • 



56 



74 



4 4.44 



* The measurements in this and all the following tables are given in millimetres. 



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Explanation of Table 1. 



1. Bison latifions, Darien, Georgia. 



2. Bison '* crassicornis.'* Eschscholtz Bay. (Measurements from Eichardson. 



3. Bison honasus. Large adult male. (M. C. Z. No. 165.) 



4. Bison americanus. Large old male. (M. C. Z. No. 10.) 



5. Bison ''2^riscusf" Eschscholtz Bay. (No. 24,576 of Eichardson.) 



6. Bison americanus. Adult female. (M. C. Z. No. 105.) 



7. Old domestic bull. 



8. Domestic ox. (Measurements from Eichardson.) 



From the above table it will be seen that the Georgia specimen is the 

 largest of the series ; that the atlas of i?. ^^ crassicornis " is next in size^ while 

 that of B. honasus is third^ though exceeding in some of its proportions either 



F 



of the above-named specimens ; the latter differs more from them in its pro- 

 portions than does the atlas of the male B. americaniis, This^ though fourth 

 in size, corresponds quite nearly in form with the fossil specimens. The atlas 

 of B. bomsus has a considerably greater sterno-dorsal thickness than either 

 of the others. The atlas of Richardson's '' Bison prisms ?'' it will be noticed, 

 corresponds very nearly in size with that of i\iQ female of B. americaniis^ being 

 apparently a little smaller^ while from Richardson's measurements and descrip- 

 tion it seems to differ but shghtly from it in form." All the parts referred 

 by Richardson to his '' B. priscus ?'' except the skull (No. 24,589 of Richard- 

 son) and a horn-core (No. 105 of Richardson) correspond in size with similar 

 parts of Bison americanus, and seem not to differ essentially in any point 

 from them. 



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