258 



ANIMAL FORMS 



Thousand-legged worms (illus.), 

 111. 



Threadworms (illus.), 52. 



Thysanura, 117. 



Tick, 138. 



Tiger salamander, 178. 



Toad (illus.), 178. 



Trap-door spider (illus.), 137. 



Trematode (illus.), 48 ; develop- 

 ment, 51. 



Trichina spiralis (illus.), 53. 



Trigger hair, 31. 



Turkey, 218. 



Turtles, 188; structure, 189; dis- 

 tribution. 194. 



Typhlichthys subterraneus (illus.), 

 163. 



Ungulata, 237. 



Vacuole, pulsating, 16 ; use of, 17. 

 Velum (illus.), 35. 

 Vespa, nest of (illus.), 131. 

 Vinegar eel (illus.), 53. 

 Volvox (illus.), 19 ; multiplication 



of, 20. 

 Vertebrates, characteristics of, 145 . 



classification, 143. 



Vorticella (illus.), 16. 



Vulpes pennsylvanicus (illus.), 241. 



Wasps, 128 ; habits of, 131. 

 Water-boatman, 121. 

 Water-bug (illus.), 121. 

 Water-dog (illus.), 178. 

 Water-flea, 95. 

 Whale, humpback (illus.), 235; 



sperm, 236. 

 Whale lice, 107. 

 Wheel-animalcule (illus.), 66. 

 Wheel-weaving spiders, 136. 

 Whippoorwill, 222. 

 White ant (illus.), 120. 

 Wood-beetle (illus.), 124. 

 Woodchuck, 233. 

 Woodcock, 216. 

 Woodpeckers, 221. 

 Worms, general characters of, 44 ; 



classification, 45. 



Yellowhammer, 221. 

 Yellow-jacket, 132. 



Zirphcea crispata (illus.), 76. 

 Zoology, 1. 

 Zoophyte, 29. 



(1) 



THE END 



