396 
NOTES. 
much more diversified now than it was in the old geologic ages; for several 
new types have come into existence, and few have dropped out. 
191 Among the types characteristic of America are the Gar-pike, Snapping- 
turtle, Hummers, Sloths, and Musk-rat. Many of our most common animals 
are importations from the Old World, and therefore are not reckoned with 
the American fauna; such as the Horse, Ox, Dog and Sheep, Rats and 
Mice, Honey-bee, House-fly, Weevil, Currant-worm, Meal-worm, Cheese- 
maggot, Cockroach, Croton-bug, Carpet-moth and Fur-moth. Distribution 
is complicated by the voluntary migration of some animals, as well as by 
Man’s intervention. Besides Birds, the Bison and Seals, some Rats, certain 
Fishes, as Salmon and Herring, and Locusts and Dragon-flies among In¬ 
sects, are migratory. 
192 When the cable between France and Algiers was taken up from a depth 
of eighteen hundred fathoms, there came with it an Oyster, Cockle-shells, 
Annelid tubes, Polyzoa, and Sea-fans. Ooze brought up from the Atlantic 
plateau (two thousand fathoms) consisted of ninety-seven per cent, of Fora- 
minirers. 
