INDEX. 



677 



Heart, iii 

 Heart shells, 367 

 Heat rigor, 63 

 Hectocotylus, 393 

 Hedgehogs, 637 

 Heliaster, 337 

 }Ielicid£e, 383 

 Helioporce, 259 

 Heliozoa, 190 

 Helix, 383 

 Hell-bender, 587 

 Hellgrammite, 482 

 Helmintlies, 169 

 Helminthophaga, 616 

 Heloderma, 599 

 Helodermatidoe, 599 

 Hemelytra, 489 

 Hemerobiidce, 482 

 Hemibranchii, 575. 577 

 Ilemichordia, 512 

 Hemimetabolous, 473 

 Hemiptera, 489 

 Ilemitripterus, 577 

 Heii. 613 

 Hen clam, 368 

 Hepatopancreas, 106, 411 

 Hepatus, 437 

 Heptanchus, 570 

 Heredity, 67, 150 

 Hermaphroditism, 118 

 Hermit crabs, 436 

 Herons, 615 

 Herring, 576 

 Hesperornis, 612 

 Hessian fly, 492 

 Heterakis, 301 

 Heteraxial symmetry, 136 

 Heterocercal tail, 41, 562 

 Iletcroconchia:, 367 

 Heterocotylea, 273 

 Heterodera, 300 

 Heterodont dentition, 625 

 Heterodont hinge, 359 

 Heterogony, 144, 145, 486 

 Heteromera, 4S4 

 Heteromyaria, 367 

 Heteronemertini, 292 

 Heteronereis, 311 



Heteronomy, 138 

 Heteropleuron, 504 

 Heteropoda, 380 

 Heteroptera, 489 

 Heterosyllis, 311 

 Heterotricha, 209 

 Hexacoralla, 259 

 Hexactinellidae, 226 

 Hexamita, 201 

 Hexanchus, 570 

 Hexapoda, 461 

 Hind brain, 533 

 Hind gut, 104 

 Hinge, 358 

 Hinny, 641 

 Hipparion, 643 

 Hippasterias, 337 

 Hippidse, 437 

 Hippocampus, 578 

 Hippocrates, 12 

 Hippocrene, 241 

 Hippoglossus, 578 

 Hippolyte, 434 

 Hippopotamidae, 641 

 Hippopotamus, 641 

 Hippospongia, 227 

 Hirudinei, 318 

 Hirudo, 321 

 Hirundinidce, 616 

 Hirundo, 616 

 Holoblastic cleavage, 153 

 Holoblastic eggs, 152, 153 

 Holocephali, 572 

 Holocystites, 342 

 Holometabolous, 473 

 Holostei, 573 

 Holostomate, 371 

 Holothuria, 349 

 Holothuria, gastrula of, 158 

 Holothuridea, 346 

 Holotricha, 209 

 Homarus, 435 

 Homaxial animals, 135 

 Homo, 651 



Homocercal tail, 41, 563 

 Homoiothermous, 115 

 Homology, 14, 100 

 Homonomy, 138 



