Earthworm, alimentary canal of Fish, egg of (illus.), 79; embry onic stages of (illus.), 87; -louse Fishes, man-of-war (illus.), 175; Flatworm, alimentary canal of Flounder, development of (illus.), Form, primitive, 20. Emmydrichthys vulcanus (illus.), Fossil, 18. 132. Endoblast, 82. Endoderm, 33. Environment, instincts of, 248. Eucope (illus.), 42. Eudorina elegans (illus.), 28. Exocatus (illus.), 131. Fresh-water animals, barriers af- Fur seal (illus.), 136. Galapagos Islands, animals of (illus.), 278; locusts of (illus.), 280. Gall, giant, of white oak (illus.), 143. Galls, insect, on leaf (illus.), 144. Gapes, worm which causes, 60. Eye of dragon-fly (illus.), 239; of Gastrula, 82. jelly-fish (illus.), 238. Gemmule, 35. Generalization, 66. Fauna, 296; bassalian, 305; littoral, Generation, spontaneous, 51. 306; pelagic, 304. Faunal areas of the sea, 304. Feeding habit of Californian woodpecker (illus.), 128, 129; of Melanerpes formicivorus bairdii | (illus.), 128, 129; instincts of, 244. Female, 57. Generations, alternation of, 51. Gerrhonotus scincicauda (illus.), Giraffe (illus.), 126. Globigerina-ooze, 18. Globigerinæ, 16. Gonium, 25-30. Gonium pectorale (illus.), 25. Hydra vulgans (illus.), 38. Grasshopper, auditory organ of Icerya and Vedalia, 121. Gregarinidæ, 14. Gregarina polymorpha (illus.), 14. Indo-African realm, 301. Inorganic matter, 112. Habitat, relation of species of, 283. Instincts, altruistic, 243; classifi- Habits, domestic, 257. Habits, nest-making, of birds, 264; Hermaphroditism, 60. Hermit-crab, with the sea-anemone Hibernation, 103. Hiving honey-bees (illus.), 154. Honey-bee (illus.), 150; adult and larva (illus.), 83; leg of (illus.), cation of, 243; concerned with Invertebrates, nest-making habits Irritability, 8, 240. Island, coral (illus.), 44. Jack-rabbits, showing variation Jay, Canada (illus.), 138. Honey-bees, hiving a swarm of Jelly-fish, eye of (illus.), 238. Lady-fish, metamorphosis of (illus.), | Marks, recognition, 22, 129, 223. 98. Larva, 92; of the mosquito, 93; Lepas, adult and larva (illus.), 195; Lernæocera (illus.), 188. Life, communal, 168; duration of, Light, influence of, on animals, 237. Lipeureus densus (illus.), 188. Littoral fauna, 306. Lizard, alligator (illus.), 204. Lizzia koellikeri, eye of (illus.), 238. Medusa, 41. Melanerpes formicivorus bairdii, Metamorphosis, 90; of Albula vul- Metazoa, 32. Metridium dianthus (illus.), 43. Migration of lemming, 118; of lo- Locust, post-embryonic develop- Mind, 255. ment of (illus.), 91. Locusts of Galapagos (illus.), 280. Louse, sucking (illus.), 188. Macropus rufus, 139. Mad Tom (illus.), 132. Male, 57. Mining-bee, nest of (illus.), 160. Islands Molt, 91. Mammals, care of young of, 268. Manatee (illus.), 277. Monarch butterfly (illus.), 219; Mosquito, auditor organ of (illus.), Man-of-war, Portuguese (illus.), Moth, cankerworm (illus.), 59. 175. Mantis (illus.), 127. Many-celled animal, 2. Marine Protozoa, 15. Mountains as barriers to distribu tion, 293. Mouth parts of mosquito (illus.), 127. Mouse-fish in gulf-weed (illus), 208. Mutual aid, 163. Narcine brasiliensis (illus.), 135. Nest-making habits of birds, 264;| Nokee (illus.), 132. Nomeus gronovii (illus.), 175. 234; of grasshopper (illus.), 234; Organic matter, 112. Osprey Falls (illus.), 285. Ox, alimentary canal of (illus.) 67. Pagurus (illus.), 176. Pandorina sp. (illus.), 26. Paramecium aurelia (illus.), 10. 11. Parasite of caterpillar (illus.), 190; Parasites, simple structure of, 181. Obelia, alimentary sac of (illus.), Parthenogenesis, 60. 69. Esophagus, 67. Omasum, 67. One-celled animals, 2. Organ, 63; auditory, of cray-fish Patagonian realm, 302. Pediculus (illus.), 188. Pelagic fauna, 304. Pelican, brown (illus.), 125. Pharynx, 71. Protective resemblance, 201. Phlegethontius carolina, larva of Protoplasm, 3; chemical constitu (illus.), 192. Polygamy, 59. Polymorphism, 42. Polyps, 37. tion of, 4; physical constitution of, 4. Protozoa, 1; colonial, 24; marine, 15. Psaltriparus minimus, nest of (illus.), 270. Pseudopod, 5. Pterophryne histrio in Sargassum (illus.), 208. Pupa, 93. Polistes, parasitized by Stylops Puss moth, larva of (illus.), 216. Quiescence, degeneration through, 193. Polystomella strigillata (illus.), 17. Rabbit, embryonic stages of (illus.), Planaria, alimentary canal of Realm, Arctic, 297; Australian, Prawn, adult and larva (illus.), 195. Rectum, 68. Praying-horse (illus.), 127. Pressure, a condition of animal life, 109. Primitive form, 20. Primitive life, 21. Prionus, larva of (illus.), 146. Promethea moth (illus.), 231. Prophysema primordiale (illus.), 34. Reflex action, 241. Remora (illus.), 173. Remora remora (illus.), 125. Reproduction, 9, 50; instincts of, 249. Reproductive cells, 28, 55. Resemblance, aggressive, 202; general protective, 202; protective, 201; special protective, 207; variable protective, 204. |