4 S6 



INDEX 



crop, of bird, 34S ; of earthworm, 171; 



of grasshopper, 12, 1.3. 

 crow, 375, 370, 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. 



Decapod a, 137. 



deer, 436, 438, 45 2-453, 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. 



Diffiugia, 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. 



Diptcra, 100. 



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, 360, 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, 168 ; 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. 



Echiuodcrmata, 7, 192-197. 



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

 199, 202. 



ectosarc, 222, 22^. 



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

 vinegar, 178. 



eggs, of bird, 354, 35S; of fish, 275, 276; 

 of frog, 264 ; of grasshopper, 18 ; of 

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

 turtle, 311. 



egret, 3S3, 384. 



Elasmobrauchii, 278-279. 



elephant, 442, 450. 



elephantiasis, 96, 181. 



elk, 437-138, 452. 



embryo, of frog, 2O4, 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. 



Enlomostraca, 144. 



epiphragm, 158. 



Euglcna, 224. 



Eusponzia, 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). 



exoskclctun, of crayfish, 131 ; of croco- 

 dile, a^i ; of grasshopper, 16. 



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



