4 8 4 



INDEX 



Wolf, 398. 



Woodchuck, 391. 



Wood-duck, 347. 



Wood-frog. 300. 



Wood-lice, 150. 



Woodpecker, California, 356; ivory- 

 billed. 355; red-headed, 355. 



Woodpeckers, 354. 



Wood-rat, 391. 



Worm, army, *2II. 



Worms, 127; life-history and habits 

 of, 133; classification of, 135; ma- 

 rine, *I34- 



Xiphias gladius, 285. 



Yellow-hammer, *355. 

 Yellow-jackets, 217. 

 Yellow- shank, 349. 



Zenaidura macroura, 351. 



Zoogeography, 436. 



Zooids, 98. 



Zoology, a first course in, 3; de 

 fined, 3; divisions of, 2; system- 

 atic, defined, 3. 



Zoophytes, 92. 



