INDEX 



493 



Reptilia, 7, 234, 309-333 ; economic im- 

 portance of, 332-333 ; habitats of, 

 310; poisonous, 333. 



resemblance, protective, 30. 



reservations, for birds, 390. 



respiration, in aquatic insects, 25 ; in 

 birds, 349; in crayfish, 134; in earth- 

 worm, 172; external, 250; in fish, 

 275; in frog, 250; in grasshopper, 15 ; 

 internal, 250, 251; in lamprey eel, 

 269 ; in mammal, 406 ; in mussel, 149 ; 

 in snail, 161 ; in spider, 114. 



respiratory system, 238 (see respira- 

 tion). 



retina, 262, 408 (see eye). 



rhinoceros, 441. 



Rhizopoda, 233. 



rodent, 430-434. 



Roosevelt, 470. 



roundworms, 178-182. 



ruminant, 436. 



salamander, 299, 300, 301. 



saliva, 13. 



salivary duct, 12, 13. 



salivary gland, 12. 13. 



salmon, 276, 292. 



San Jose 1 scale, 39-41, 40. 



sapsucker, 379. 



sartorius muscle, 256, 257. 



sawfish, 278, 279. 



scale insects, cottony maple, 46 ; fluted, 

 70-71 ; lac, 65 ; San Jose, 39-41, 40. 



scales, fish, 273. 



scallop, 156. 



scapula, 255. 



scarlet tanager, 383. 



scientific terms, 106-107. 



scolex, 188. 



scorpion, 118, 119. 



Scyphozoa, 210. 



sea, anemone, 207-208; cucumber, 196, 

 197 ; horse, 283 ; lilies, 197 ; lion, 106, 

 429; pen, 209; urchin, 7, 196. 



seal, 414, 429, 430. 



secretion, 220, 252; internal, 253. 



segmentation, 174. 



semicircular canals, 409. 



seminal vesicle, 262, 263. 



sense organs, of earthworm, 172; of fish, 

 274-275; of frog, 261 ; of grasshopper, 

 16; of insects, 16-17; of lamprey eel, 



269 ; of mammals, 408-410 ; of mussel, 

 150; of snail, 160; of spider, 114; of 

 turtle, 311. 



septa, of earthworm, 169, 174. 



setae, of earthworm, 170. 



shark, 278. 



sheep, 450, 451; botfly of, 50; liver 

 fluke of, 186-i88; mites on, 125; 

 mountain, 439, 440 ; nodular worm of, 

 181, 182; stomach worm of, 181, 182; 

 ticks on, 53, 54. 



shell, of mussel, 146-148; of snail, 158, 

 159 ; of turtle, 310. 



shoulder blade, 255. 



shrike, 346. 



shrimp, 139, 140, 141, 142. 



silk glands, 113, 114, 121. 



silkworm, 62-63, 230. 



silver fish, 57, 58. 



siphon, of mussel, 146, 148. 



skate, 278. 



skeletal system, 238. 



skeleton, of bird, 335, 336 ; of frog, 254, 

 255-256; of lamprey eel, 269; of 

 mammal, 410, 411; of starfish, 193; 

 of turtle, 310. 



skin, of frog, 250, 252-253; of crocodile, 

 333- 



skink, 321. 



skipper, cheese, 59. 



skull, of frog, 254, 255 (see skeleton). 



skunk, 415, 427, 454, 455, 456, 457. 



sleeping sickness, 99, 226, 228. 



sloth, 435. 



slug, 161. 



smallpox, 228. 



smell, in insects, 17; in mammals, 410 

 (see sense organs). 



snail, 7. 158-161; food of, 160; fresh- 

 water, 162; locomotion of, 159; ma- 

 rine, 163 ; respiration ip, 161 ; sense 

 organs of, 160; shell of, 158. 



snakes, black, 325 ; blow, 325 ; coral, 

 331; eggs of, 324; eyelids of, 322; 

 garter, 324, 325 ; grass, 324, 325 ; har- 

 lequin, 331; harmless, 324; hognose, 

 325; horsehair, 178; poisonous, 326; 

 scales of, 322; teeth of, 324; tongue 

 of, 324; water, 325. 



sole, 288. 



somite, 174. 



sparrow, chipping, 380; English, 379, 



