INDEX. 
Abdomen, definition of term, 156. 
Acineta or tube-sucker, 21. 
Acontia or darts of the anemone, 
70. 
Acorn barnacle, structure of the, 
174, 175. 
Actinozoa, 55. 
Africa, scorpions of, 180. 
Africa, termite mounds of, 230. 
Air-thimble of water-spider, 197. 
Air-tubes of insects, 212. 
America, harvesting ants of, 293- 
295 ; scorpions of South, 180. 
Amoeba, feeding, 18. 
Anemone, section of an, 67. 
Anemones of the sea, 66 ; group of, 
6S ; their rank among animals, 
10 ; birth of young, 69 ; food 
and enemies of, 69 ; lasso-cell 
of, 53 ; parasitic on hermit-crab, 
172. 
Animal, first walking, 89 ; the 
simplest, 16. 
Animals, distribution of, 7 ; which 
change their form during life, 
234. 
Animal-trees, 56. 
Ants, agricultural, 295 ; foraging, 
297 ; garden, 277-287 ; harvest- 
ing, 293; hill or horse, 271-277; 
leaf-cutting, 297; meadow, 287; 
negro, 288-291 ; red, 288 ; liv- 
ing in hollow thorns, 297 ; slave- 
making, 288 ; antennae-language 
of, 274; and aphides, 270-278; 
capturing termites, 296 ; cocoons 
of, 280 ; eggs of, 279 ; food 
of, 276 ; friendliness of, 298 ; 
manner of digging, .275-283 ; 
nests of, 279, 283, 295 ; number 
in one nest, 270 ; migrations of, 
283 ; points of resemblance to 
man, 270; recognition by, 287 ; 
road-making of, 284, 296 ; roll- 
ing cocoons down a slope, 297 ; 
slave-making expeditions, 289 ; 
stinging and stingless, 272 ; 
structure of, 272 ; wars of, 285 ; 
winged, 282 ; nervous system of 
the, 276 ; young needing more 
help than the bee, 267 ; feeding 
each other, 278. 
Antedon (Comatula) rosacea, 90. 
Antennae of insects, 156. 
Antennules of prawn, 160. 
Ant-lion, funnel of the, 225. 
Aphides, 201 ; eggs protected by 
ants, 287, 292; multiplication of, 
203 ; winged, 203 ; their rela- 
tion to ants, 278, 292. 
Aphrodite or sea-worm, 151 ; his- 
pida, harpooned bristles of, 
152. 
Apple-trees destroyed by aphides, 
205. 
Arctic regions, small :rustaceans of, 
160. 
Argonaut, figure of, 132 ; does not 
