INDEX 



955 



Hormones — (Continued) 



gestational (progesterone), 85 

 gonadotrophic, effects on development of 



mammalian egg follicle, 72 

 influence of on mammalian development, 



885 

 influence of on sex differentiation, 891 

 lactogenic, luteotrophin, 103 

 male, in mating urge, 22 

 Horns, of various mammals, 586 

 Hoskins, E. R., 883 

 Hoskins, M. M., 883 

 Howard, E., 883 

 Howland, R. B., 773 

 Huber, E., 708, 718 

 Huber, G. C, 305 

 Human, after-birth in, 926 

 chorionic vesicle of, structure of villi in, 



921 

 development of frontal bone in, 695 

 development of occipital bone in, 695 

 development of ovary of, 797 

 development of temporal bone in, 695 

 development of testis in, 792 

 development of tongue of, 609 

 developmental features of face, 535 

 digestive tract of, characteristics of mu- 

 cous membrane of, 620 

 structural composition of walls of, 629 

 facial and cervical muscles derived from 



hyoid arch mesoderm in, 719 

 female, artificial insemination of, 199 

 female, reproductive cycle in, 107 

 formation of metanephric kidney in, 784 

 heart of, converging veins of, 747 

 implantation of embryo in, 919 

 kidney of, 776 



male, acroblast in forming sperm of, 150 

 later stages of spermatogenesis in, 148 

 morphogenesis of sperm in, 146 

 morphogenesis of digestive tract of, 606 

 olfactory area of nasal passage in, 843 

 pectoral girdle in, 689 

 pelvic girdle in, 689 

 placentation in, 918, 923 

 relation of embryonic chondrocranium 

 of to adult skull, 680-68 It 

 Human ear, three-dimensional schematic 



drawing of, 851 

 Human embryo, development of liver in, 

 626 

 differentiation of truncal myotomes in, 



714 

 extra-embryonic membranes in, 972 

 formation of placenta of, 921 

 late gastrula of, 432 

 liver-septum complex formation in, 865 



Human embryo — (Continued) 



muscle development of, 710, 711, 712, 



713 

 of ten somites, 499 

 parathyroid gland of, 878 

 sites of blood-cell formation in, 735 

 thymus gland of, 878 

 thyroid gland of, 878 

 Humphrey, R. R., 120, 890 

 Huxley, layer of in hair, 583 

 Huxley, T. H., 536 

 Hyaline cartilage, 658, 665 

 Hyaloid artery, 846 



canal, 846 

 Hyaluronidase, 33, 229 

 Hydrochloric acid, secretion of, 621 

 Hydromantes genei, sperm transport in fe- 

 male, 191 

 Hydromantes italicus, sperm transport in 



female, 191 

 Hyla crucifer, xviii 



Hyoid arch, facial and cervical muscles in 

 mammals derived from meso- 

 derm of, 719 

 Hyoid somite, in sharks, 716 

 Hyomandibula portion of hyoid arch, 673 

 Hyomandibular cleft, 851 

 Hypaxial (hypoaxial) region, of vertebrate 



body, 494 

 Hypaxial muscle groups, 706 

 Hypaxial musculature, of Necturus, Idl 

 Hypermastia, 590 

 Hyperthelia, 590 

 Hypertonic sea water, and egg activation, 



217, 218 

 Hypoblast, 347, 352 



formation of in reptiles, 361 

 primary, conversion into secondary hy- 

 poblast in teleost fishes, 438 

 Hypoblast layer, of chick blastula, 343 

 Hypochord (subnotochordal rod), 655 

 Hypodermis, 556 

 Hypogeophis alternans, xviii 



blastulation and gastrulation in, 446 

 late blastoderm of, 369 

 Hypogeophis rostratus, beginning gastrula 



of, 369 

 Hypoglossal nerve (cranial n. xii), 717, 833 

 Hypoischial midpiece, of pelvic girdle, 693 

 Hypomere, contributions of, to developing 

 heart and gut structures in rep- 

 tiles, birds, and mammals, 529 

 to formation of gut tube, 528 

 to formation of heart structures, 528 

 definition of, 492 

 derivatives of, 527 

 early differentiation of, 527 

 Hypophysectomy, and testis, 39 



