258 ANIMAL 
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.), 58. 
Trigger hair, 31. 
Turkey, 218. 
Turtles, 188; structure, 189; dis- 
tribution, 194. 
Typhlichthys subterraneus (illus.), 
163. 
Un gulata, 237, 
Vacuole, pulsating, 16; use of, 17. 
Velum (illus.), 35. 
Vespa, nest of (illus.), 181. 
Vinegar eel (illus.), 58. 
Volvoz (illus.), 19; multiplication 
of, 20. 
Vertebrates, characteristics of, 145, 
classification, 143. 
THE 
FORMS 
Vorticella (illus.), 16. 
Vulpes pennsylvanicus (illus.), 241. 
Wasps, 128; habits of, 181. 
Water-boatman, 121. 
Water-bug (illus.), 121. 
Water-dog (illus.), 178. 
Water-flea, 95. 
Whale, humpback (illus.), 285; 
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. 
Zirphea crispata (illus.), 76. 
Zoology, 1. 
Zoophyte, 29. 
(1) 
END 
