INDEX 



597 



Crayfish — 



limbs of, 241. 



mouth appendages of, '245. 



nervous system of, 259. 



podobranch of, 257. 



reproduction 1 of, 264. 



respiratory organs of, 257. 



sense organs of,' 261. 



skeleton and muscles of, 248. 



thorax of, 240. 



walking leg of, 246. 

 Crest, cnemial, 437. 

 Crocodiles, 393. 



skull of, 390. 

 Crocodilia, 393, 519. 

 Cross-fertilisation, 126, 199. 

 Crustacea, 267, 268, 515. 

 Cuttlefish, 3-25. 

 Cycle, life, 8. 



of various animals. See Life- 

 history. 

 Cyclostomata, 374, 517- 

 Cyst of Amceba, 117, 119. 



of Cercaria, 207. 



of Entamceba, 145, ' 147. 



of Monocystis, 126. 



of Opalina, 159. 



of Polytoma, 123. 



of Trichinella, 305. 

 Cysticercus, 211. 

 Cytoplasm, 83. 



Dactylopodite, 241. 



Darwinism, 525. 



Death, no. 



Dehydration, 554. 



Demodex folliculorum, 269, 270. 



Dendrites, 93. 



Depression, 137, 195. 



in Amceba, 116. 



in Hydra, 170. 



in Paramecium, '137, 195- 

 Development, 9, 181. 



of birds, 504. 



of crayfish, 509. 



of dogfish, 359, 491. 



of earthworm, 508. 



of frog, 487. 



of Hydra, 171. 



of invertebrates, 508. 



of lancelet, 478. 



Development — 



of liver fluke, 204. 



of mammals, 508. 



of Obelia, 179. 



of swan mussel, 324, 508. 

 See also Life-history. 

 Diastema, 439. 

 Differences between animals, I, 



18. 

 Differentiation, 18. ' 

 Digestion, 6. 



in Amceba, 115. 



in Amphioxus, 334. 



in crayfish, 253. 



in earthworm, 221. 



in frog, 50. 



in Hydra, 170. 



in mussel, 317. 



in Paramecium, 132. 



in pigeon, 410. 



in rabbit, 441. 



in Vorticella, 140. 

 Digestive organs, 18. 'See also 



Canal, alimentary. 

 Digitigrade, 464. 

 Dimorphism of gametes, 10, 198. 

 Diploblastica, 230, 513. 

 Dipnoi, 377, 383, 518. 

 Diptera, 290, 515. 

 Disc, of Vorticella, 138. 

 Discs, imaginal, 286. 

 Disintegration of body-substance, 



2, 17. 

 Dissecting dish, 551. 



instruments, 551. 

 Dissection, 552, 555. 

 Distomum hepaticum,.2.0\. 

 Distribution, 523, 540. 

 Division of nuclei, 103. 



of Amceba, 118. 



of Paramecium, 134. 

 Dog, skull of, 469, 470. 

 Dogs, 471. 

 Dogfish, 340. 



alimentary system of, 350. 



blood vessels of, 359. 



excretory organs of, 354. 



external features of, 340. 



generative organs of, 356. 



heart of, 359. 



limbs of, 341. 



