INDEX 



747 



Hydroids, 102 



Hydrolysis, 8 



Hydrorhiza, 103 



Hydrotheca, 104 



Hydrozoa, iii 



Hymenoptera, 260 



Hyoid apparatus, of frog, 356 



of pigeon, 404 



of rabbit, 430 



arch skeleton of dogfish, 319 

 Hyostylic, 582 

 Hypapophysis, 424 

 Hypermetamorphosis, 247, 260 

 Hyperphalangy, 559 

 Hypoblast, 187, 622, 647 

 Hypocercal, 553 

 Hypoderma, 148 

 Hypodermis, 135 

 Hypomere, 627 

 Hypopharynx of cockroach, 231 



of insects, 240 



of mosquito, 243 

 Hypophysis, 368, 387, 573 

 Hypostome (oral cone), 90 

 Hyracoidea, 491 



Ichneumon flies, 149, 261 

 Ichthyopterygium, 555 

 Ichthyosauria, 554, 555 

 Ileum of cockroach, 233 



of frog, 365 



of pigeon, 408 



of rabbit, 443 

 Iliosciatic foramen in the pigeon, 



406 

 Ilium, 358, 405, 436, 561 

 Imago, 245 

 Immigration, 649 

 Immunity, 150 

 Inclusions, 499 

 Incorporation of food, 7 

 Incus, 428, 586 

 Individuality, no 

 Infundibulum, 368, 387, 608 



of rabbit, 446, 461 

 Inguinal canal, 455 

 Inhalant canals of sponges, 84 

 Inheritance of acquired characters, 



725 

 Insecta, 222 



Insectivora, 4y5, 488 



Insects, 240 



life-history of, 245 



mouth-parts, 240 



wings, 245 

 Insertion, of muscle, 422, 539 

 Instar, 245 



Instep, 418. See Metatarsus 

 M.Z. — 24* 



Instincts, 415 

 Insulin, 471 

 Intercalary pieces, 316 

 Intercellular substance. See Ground 



substance 

 Interclavicle, 404, 560 

 Intermediate cell mass, 642, 657 

 Internal environment, 454 

 Interradius, 287 

 Interrenal body, 344 

 Interstitial cells, 91, 445 

 Intervertebral discs, 517 



notches, 423 

 Intestine — 



histology of, 509 



structure of, 15 



of vertebrates, 594 



See also Canal, alimentary 

 Invagination, 622, 630 

 Invertebrates, development of, 670 

 Ions, as food, 7 

 In vitro, 504 

 In vivo, 504 

 Iris, 465 

 Irritability, 2, 7 



in Amoeba, 29 

 Ischiopodite, 197 

 Islets of Langerhans, 445, 471, 510, 



530 

 Isogamy, 39 



Isolation, 721 



Isopoda, 221 



Isoptera, 249 



Itch, 224 



Iter, 337, 608 



Ixodes, 2,2,^ 



Jacobson's anastomosis, 388 , 

 Jaw, lower, 585. See Mandible. 



upper, 581. See Skull 

 Jaws of dog, 429 



of frog, 355 



suspension of, 319, 582 



of vertebrata, 582 

 Jelly-fish, 112 

 Jerboas, 485 

 Joints, 421, 539 

 Juice, gastric, 13 



Kala-azar, 67 

 Kangaroos, 495 

 Kappa, 705 

 Karyogamy, 6 

 Karyokinesis, 688 

 Karyosome, 65 

 Katabolism, 14 

 Keber's organs, 279 

 Keel, 405 



