S. F. Baird on North American Birds. 87 
of temperature, to interrupt or affect their passage by way of 
Rupert's land to the shores of the Arctic ocean.” 
lachian “island.” Thus we have Amzia, Lepidosteus, Mic 
(Grystes), and various other forms of fishes throughout the Missis- 
he James or Lower Potomac except as 
stragglers. The soft shelled turtles, and the great mass of the 
" The hoes cag Region towards the north and northeast passes into a well 
t 
marked subdivision, called by Prof. Verrill in his paper on the birds of Norway, 
le, the “Canadian.” This he correctly rizes t presence of certain 
Species during rep certain near allies, in what, with Prof. 
breeding season, replacing 
Z, we may term the Alleghanian subdivision. Some of the ch ic 
and more or less parallel species of birds in these two subdivisions he considers to 
is 
be the following 
Alleghanian, ian. 
Dendroica discolor, Dendroica striata, 
Pipilo erythrophthalmus, Chrysomitris pinus, 
Spizella socialis. Curvirostra leucoptera, 
Junco byemalis, i 
Perisoreus Canadensis, 
Picoides arcticus, 
Tetrao Canadensis. ee 
Canadian sub-province includes especially the highlands between Hudson 
Bay and the Taree wi ba Gene i ato Northern Wi 
