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, Snnpping- 

 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. 



194 When the cable between Franca 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- 

 minifer?. 



