INDEX. 



797 



349 

 348 

 349 

 348 

 577 

 340 

 240 



577 



322 



305 



262 



354 



54 



173 



Helix, External appearance of, 

 Mode of life of, 

 Shell of, 

 Structure of, 

 Heloderma, 

 Hemiaspis, 

 Hemiaster, 

 Hemichorda, 

 Hernidactylus 

 Hemimetabolic Insects, 

 Hemiptera, 

 Hepatopancreas, 

 Heredity, . . . 

 Hermaphrodite duct of Snail, 

 Hermaphroditism, .. 

 ofCestodes, 



Chaetognatha, 222 

 Cirripedia, . 280 

 Crustacea, . 280 

 Cymothoidae, 277 

 Earthworm, 194 

 Frog tadpole, 555 

 Leech, . 219 

 Myxine, . 460 

 Myzostomata, 212 

 Tardigrada, 337 

 Trematoda, 1 70 

 Tunicata, . 407 

 Turbellaria, 162 

 Invertebrates, 463 

 Hermione, . . . .210 

 Herpestes, . . . . 715 

 Herring, . . . 503, 510 

 Hesperornis, . . . .619 

 Heteroceras, .... 385 

 Heterocercal, . . .518 



Heterocoela, . . . .125 

 Heterodera, . . . .185 

 Heterodont dentition, . . 645 

 Heteromya, .... 372 

 Heterophrys, . . . .100 

 Heteropods, .... 357 

 Heterotricha, ... 105 



Hexacoralla, . . . 157 



Hexactinellida, . . .116 

 Hexapoda = Insects, . -313 

 Hind gut = Proctodseum, . 449 

 Hippocampus, . . .511 

 of brain, . . 668 



Hippolyte, .... 279 



Hippopotamus, . . . 693 

 Hippotherium, . . .701 

 Hippurites, .... 374 

 Hirudinea, . . . .213 

 Classification of, . 221 

 Hirudo, . . . . .214 

 Structure of, . 214-21 

 Histology, ... 30, 37 

 Histriodrilus, . . . .212 

 Hoatzin Opisthocomus, . 618 

 Holoblastic segmentation, . 65 

 Holocephali, .... 507 

 Holophytic, .... 95 

 Holopneustic, . . .314 

 Holopus, .... 244 

 Holothuria, .... 243 

 Holothuroidea, . . . 240 

 Classification of, 243 



Holotricha, .... 90 

 Homarus, . . . 253, 278 

 Homo, .... 728-30 

 Homocercal, . . . .518 

 Homocoela, . . . -125 

 Homodont dentition, . . 645 

 Homology of organs, . . 33 

 Homoplastic, 33 



Honeycomb bag, . . . 697 

 Hoplonemertea, . . .180 



Horns, 641 



Horse, 700 



Horse-shoe Crab, . . -337 

 House fly, .... 304 

 Howling monkeys, . . 725 

 Huanaco, .... 696 

 Humerus, .... 434 



Hyaena, 715 



Hyaenodon, . . . .717 



Hyalea, 358 



Hyalonema, . . . .125 



Hydatina, .... 223 



Hydra, . . 32, 3^, 131, 134 



Budding of, . . . 51 



,, Development of, . .138 



General life of, . .134 



,, structure of, . 135 



Minute . 136 



Muscle system of, . 38 



,, Physiology of, . . 15 



Reproduction of, . 49, 138 



Hydrachna, .... 336 



