482 NOTES 



life is 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. 



178 Among the types characteristic of America are the gar pike, snapping 

 turtle, hummers, sloths, and muskrat. 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, 

 honeybee, house fly, weevil, currant worm, meal worm, cheese maggot, 

 cockroach, croton bug, carpet moth, and fur moth. Distribution is com- 

 plicated by the voluntary migration of some animals, as well as by man's 

 intervention. Besides birds, the bison and seal, some rats, certain fishes, 

 as salmon and herring, and locusts and dragonflies among insects, are 

 migratory. 



179 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 foraminifers. 



