322 



INDEX. 



Spores, 136. 



of plants, resistance to heat, 23. 

 Squamella, 268. 

 Squid, 206. 

 Starfish, 177, 181. 



reproduction of lost parts, 91. 

 Stentor, (52, 84, 160, 163. 



building of, 65. 



development of, 288. 



egg of, 31. 



nervous system of, 64. 



young of", 148, 288. 

 Sting-blubber, 70. 

 Stomacbs of Infusoria, 167. 

 Stripe, primitive, 305. 

 Subordination of types to bilaterality, 



128. 



Subsidiary layer, 304. 

 Suctoria, 285, 286. 

 Sunfish, 67. 

 Symbolical form of animals, 122, 158. 



T. 



Tzenia, 83. 



Tape-worms, 82, 215. 



Tardigrada, 2H8, 274. 



Tentacles, 57, 177. 



Tetraspora, 155. 



Thorax of Insects, 222. 



Thuret on spores of aquatic plants, 133. 



sea-weeds, 133. 

 Torula, 20. 

 Tracheae, 224. 

 Transitions among classes, 254. 



minor groups, 262. 

 species, 276. 

 ideal, 236. 



Trembley's experiments on Hydra, 89. 

 Trepang, 120, 177, 187. 

 Trumpet-animalcule, 62. 

 Tubularia, 75, 79, 238. 



bilaterality of, 239. 

 arrangement of tentacles of, 



239. 

 development of tentacles, 239. 



Turtle, snapping, 304. 



development ot, dU4. 

 Turtles and Tortoises, development of, 



303. 



Turtles' eggs, 37. 

 Twins, 86. 



Type of division, 160. 

 Types of animals, 117, 122. 



the five great, 122, 160, 248. 

 Typical animal, 265. 

 bird, 277. 

 egg, 32. 

 forms, relation of organs in, 126. 



U. 



Diva, 143, 155. 



Uniformity of the organization of Mol- 

 lusca, 195. 



Up and down, relations of animals to, 

 121. 



V. 



Van Beneden on Linguatula, 273. 



Lerneans, &c., 274. 

 Van der Hceven, on Vorticellse, 243. 

 Vascular area, 309. 

 Vaucher on spores of plants, 132. 

 Vena terminally, 309. 

 Vertehrre dorsales, 311. 

 Vertebrae, preliminary, of embryo, 310 

 Vertebral arches, 232. 



column, elements of, 125. 



layer, 307. 

 Vertebrata, 118, 226. 



development of, 303. 



Vibrio, 96. 



baccillus, 25. 



rugula, 18, 102. 



resistance to heat, 23, 26. 

 Vibrios, false, 97. 

 Vital affinity, 7. 



Vitality, degrees of, in eggs, &c., 99. 

 Vitelligenous organ, 36. 

 Volvox, 153, 156. 



Von Baer on embryonic types, 252. 

 Vorticellffi, 161, 237. 

 Vortifi-llida?, Agassiz on, and Bryozoa, 

 174. 



W. 



Wagnerian vesicle, 32, 35. 

 Water, composition of, 8. 

 What is an animal, 132. 

 Winged mammals, 278. 



quadrupeds, 278. 

 Winter-eggs, 275. 

 Worm-shaped embryo of Starfish, 248, 



250 



Moll uscan, 248. 



Wright, Dr. Strethill, on Zoiiteira, 50. 

 Wyman, Prof. J., experiments of, 15. 



Y. 



Yeast-plant, 20. 



development of, 20. 



Yolk and albumen of eggs, diverse ori- 

 gin of, 35. 

 of the egg, 33. 



Z. 



Zoiiglcea, 19. 

 Zoophyta, 120, 177. 



development of, 289. 

 and Articulata, 246. 

 Bryozoa, 246. 

 Protozoa, relations of, 237. 

 Zoospores, 140. 

 Zoi'iteira, 50, 156. 

 ZoiJthamnium, 163, 175. 



