Botany and Zoology. 145 
, and a single — the well-known Big-horn of 
ne aia Ovis montana. Musk-ox of the Arctic 
* ee, ke, does not occur within ane limits of the United States 
‘= the alo, Bison Americanus, — the catalogue of N 
as erican iriinan ts, pie up a total of 14 animals of this order. 
What a contrast in this respect does North America present to 
where more than 60 species of Antelopes alone are already known to 
occur, and the list is daily increasing! For, though we may laugh at 
oa ‘Great Continent’ is far more productive of animal forms of a more 
Ft highly organized structure, and of a nature more adapted to meet me 
oe various wants of mankind. 
Table of Genera of North American Mammalia, according to Prof. Baird. 
[The first column of figures gives the number of species examined by Prof. Baird 
himself, and the second, in brackets, those he has not examined.) — 
Species. Species. 
E Rapacta. 0. Castoroides, 
1. Soricide— 10. aera a 
31. Geom. 
[4] 32. Wicanemes 
33. Dipodomys, 
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34. Perognathus, 
[1] 11. Muride— 
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