INDEX. 
Halicore, 596 
Halistemma carum, 70 
Halophila borealis, 188 
Halyclystus auricula, 64 
Haplodon rufus, 585 
Haplophyllia paradoxa, 84 
Hare, varying, 586 
Harmony between animals and 
their surroundings, 675 
Harvest-men, 342 
Hatteria, 511 
Hearing, organs of, 250 
in mollusks, 250 
in insects, 326 
Heliopora cceerulea, 85 
Heliozoa, 27 
Helix albolabris, anatomy of, 
245 
Hell-bender, 479, 
Heloderma horridum, 504 
suspectum, 504 
Hemiaster cavernosus, 121 
Philippii, 121 
Hemippus, 604 
Hemiptera, 349 
Herring, 450 
Hesperornis, 538 
Hessian fly, 357 
Heteromita, 33 
Heterodontide, 416 
Heteropoda, 250, 253 
Hexapoda, 344 
Hexathyridium pinguicola, 152 
venarum, 152 
Himantopus nigricollis, 545 
Hipparion, 602 
Hippocampus, 443 
Hippocampus minor, 618 
Hippopotamus, 605 
Hirudinea, development of, 167 
structure of, 164, 176 
Hoasin, 547 
Holocephali, characters of, 424 
Holopus. 186 
709 
Holothuria edulis, 217 
Floridana, anatomy of, 213 
Holothuroidea, 208, 218 
Homology, 12 
Homo sapiens, 624 
Horned toad, 503 
Horn-tail, 380 
Horse, genealogy of, 602 
races of, 604 
House-fly, 354 
Humming-bird, 551 
Hyalonema boreale, 48 
Hy bocodon, 60 
Hybrid ducks, 548 
Hybridity, 657 
Hydatids, 116 
Hydra, anatomy of, 52 
development of, 56 
vulgaris, 52 
Hydractinia echinata, 56 
Hydroidea, 52, 72 
Hydrozoa, 52, 71 
classification of, 73 
nervous system of, 62, 65 
organs of taste in, 63 
; Hyla Pickeringii, 484 
Hylobates, 622 
| Hylodes Martinicensis, 485 
Hymenoptera, 359, 367 
Hyocrinus, 184 
| Hyoganoidei, 481 
Hyperia, 68, 291 
Hyperoartia, 410 
Hyperotetra, 410 
Hypobythius calycodes, 392 
| Hypodermis, 289 
Hyracoidea, 599, 629 
| Hyrax, 599 
Inu, 273 
Ichneumon-fly, 361 
Ichthyopterygia, 511, 517 
Ichthyornis, 538 
Ichthyosaur, 512 
