INDEX 



321 



Colon, 68. 



Colonial jelly-fishes, 45 ; Protozoa, 



24. 



Colony, 31. 

 Color, 222. 



Coloration, alluring, 216. 

 Colors, warning, 212. 

 Commensalism, 172, 173. 

 Communal life, 168; advantages 



of, 170. 



Communities, animal, 149. 

 Conditions, primary, of animal 



life, 106. 



Conjugating cells, 28. 

 Conjugation, 11, 27, 55. 

 Contractile vacuole, 10. 

 Coral, brain, 45 ; island (illus.), 

 44 ; organ-pipe (illus.), 45 ; red, 

 45. 



Corals, 37-43. 

 Corynolophus reinhardti (illus.), 



124. 



Cottony cushion scale (illus.), 142. 

 Courtship, instincts of, 248. 

 Crab, metamorphosis of (illus.), 97 ; 



with sea-anemone (illus.), 177. 

 Cray-fish, auditory organ of (illus.), 



233. 

 Cricket, auditory organ of (illus.), 



234. 



Cricket, mole (illus.), 146. 

 Crinoid (illus.), 305. 

 Crop, 71. 



Crowd of animals, 114. 

 Crustaceans, adults and larvae 



(illus.), 195. 

 Cteniza californica, nest of (illus.), 



261. 



Cyanocitta cristata (illus.), 138. 

 Cycle, life, 78. 

 Cypselurus (illus.), 131. 

 Cytoplasm, 3. 

 22 



Dead-leaf butterfly (illus.), 211. 



Death, 103. 



Deep-sea angler (illus.), 124. 



Deer, horns of (illus.), 148. 



Defense of the young, 137. 



Degeneration, causes of, 197, 198; 

 human, 200 ; through quiescence, 

 193. 



Desiccation, 104. 



Development, 78 : continuity of, 

 83 ; divergence of, 84 ; embry- 

 onic, 80; first stages in (illus.), 

 81 ; laws of, 86 ; metamorphic, 

 90; of flounder (illus.), 100; of 

 locust (illus.), 91 ; of vertebrates, 

 (illus.), 87; post-embryonic, 80; 

 significance of facts of, 89. 



Diapheromera femorata (illus.), 

 209. 



Differentiation, 41 ; of structure, 

 64. 



Dimorphism, 42 ; sex, 58. 



Diodon hystrix (illus.), 134. 



Dismal Swamp fish (illus.), 282. 



Distribution, character of barriers, 

 to, 288; geographical, 272; in- 

 fluenced by climate, 291; laws 

 of, 274; modes of, 296; moun- 

 tains a barrier to, 293 ; of Cana- 

 dian Skipper butterfly (illus.), 

 273 ; of clouded Skipper butter- 

 fly (illus.), 273 ; of Erynnis mani- 

 toba (illus.), 273; sea a barrier 

 to, 288; temperature a barrier 

 to, 290. 



Diverticula, 74. 



Division of labor, 22, 168. 



Dog, pointer (illus.), 256. 



Dragon-fly, eye of (illus.), 239. 



Duck, family (illus.), 137. 



Duodenum, 68. 

 Duration of life, 101. 



