4 86 



INDEX 



crop, of bird, 348; of earthworm, 171; 



of grasshopper, 12, 13. 

 crow, 375, 379, 389. 

 Crustacea, 107, 137-144. 

 cuckoo, 371, 380. 

 Culex mosquito, 87. 

 cuticula, of insects, 16. 

 Cuvier, 473. 



Cyclops, 140, 141; and disease, 143, 181. 

 cyclostomes, 235, 268, 270. 

 cysticercus, 189, 190. 



daddy longlegs, 120. 



Daphnia, 140, 141. 



Darwin, 4, 173, 474. 



Decapoda, 137. 



deer, 436, 438, 452^*53, 465-466. 



Demos pongice, 217. 



dengue, carried by mosquitoes, 96. 



dentine, 404, 405. 



Dero, 176. 



development, 269 (see embryology, and 

 metamorphosis) . 



devilfish, 166. 



diaphragm, 402, 407. 



Difflugia, 225. 



digestion, in crayfish, 133 ; in earth- 

 worm, 171; in frog, 246; in grass- 

 hopper, 13 ; in Hydra, 203 ; intra- 

 cellular, 203 ; in mammals, 403 ; in 

 mussel, 150; in Paramecium, 219. 



digestive glands, of crayfish, 134 (see 

 liver) . 



digestive system, 237-238 (see digestion). 



digits, 255. 



dimorphism, 205. 



Diplopoda, 129. 



Dipnoi, 284. 



Diptera, 109. 



dispersion, law of, 417. 



dissimilation, 220. 



distribution of animals, 416-418. 



division of labor among cells, 202. 



dog, brain of, 407 ; family of, 424-425 ; 

 flea of, 52, 53; prairie, 432; teeth of, 

 405. 



dogfish shark, 278. 



dolphin, 442. 



domestic animals, parasites of, 48-56. 



domesticated birds, 380. 



dove, 369, 380. 



drone honeybee, 63. 



duck, 381 ; Labrador, 414; wood, 366. 

 duckbill, 419. 

 dysentery, 78, 228. 



eagle, bald, 366 ; golden, 379. 



ear, of fish, 275 ; of frog, 258, 261 ; of 

 lamprey, 269 ; of mammal, 409. 



earthworm, 161, 168-175 ; anatomy of, 

 169,170; burrows of, 1 68; circulation 

 in, 171; digestion in, 171; economic 

 importance of, 173 ; excretion in, 171 ; 

 food of, 171; locomotion of, 168; 

 nervous system of, 172; reproduction 

 of, 173; respiration of, 172; segmen- 

 tation of, 174; sense organs of, 172. 



Echinodermata, 7, 192-197. 



ectoderm, of frog, 265, 266 ; of Hydra, 



199, 202. 



ectosarc, 222, 223. 



eel, 235; mud, 301, 302; true, 282, 283; 



vinegar, 178. 

 eggs, of bird, 354, 358; of fish, 275, 276 ; 



of frog, 264; of grasshopper, 18; of 



Hydra, 199, 204; of mussel, 151; of 



turtle, 311. 

 egret, 383, 384. 

 Elasmobranchii, 278-279. 

 elephant, 442, 450. 

 elephantiasis, 96, 181. 

 elk, 437-438, 452. 

 embryo, of frog, 264, 265. 

 embryology, of frog, 264, 267 ; of Hydra, 



204; of insects, 19. 

 enamel, 404, 405. 

 endosarc, 222, 223. 

 endoskeleton, 254, 255 

 Entameba, 226, 228. 

 entoderm, of frog, 265, 266; of Hydra, 



199, 202. 



Entomostraca, 144. 



epiphragm, 158. 



Euglena, 224. 



Euspongia, 212, 216. 



eustachian tube, 409. 



excretion, 220; in earthworm, 171-172; 

 in frog, 252; in grasshopper, 15-16; 

 in mammals, 407; in mussel, 151. 



excretory system, 238; in Planaria, 184 

 (see excretion). 



exoskeleton, of crayfish, 131; of croco- 

 dile, 331; of grasshopper, 16. 



eye, of crayfish, 132, 133 ; of fish, 271, 



