978 



INDEX 



Syngnathus (pipefish), male egg pouch of, 



915 

 Synizesis, definition of, 137 

 Synosteosis, 695 

 Synovial membrane, 696 

 Syntrophoblast, 920 

 Syrinx, of bird, 649 

 System development, definition of, 518, 520 



Tadpoles, early, development of early sys- 

 tems in, 537 

 Tail axial skeleton of, 688 



muscles of, development of, 705, 710, 

 715 

 Tail bud, 47 1 

 Tail gut, 471, 482, 600 

 Tail outgrowth, 476 

 Tapetum lucidum, 849 

 Tarsal glands, 853 

 Taste-bud system. 843 

 Taste buds, caudal, innervation of, 831 



description of, 843 



innervation of, 843 

 Tatusia, armadillo, pelvic girdle and sa- 

 crum in, 689 



polyembryony in, 383, 384 

 Tavolga, W. N., 235 

 Teat (nipple), 589 

 Tectum, of mesencephalon, 822 

 Teeth, absence of in vertebrates, 605 



bony (true), 605 



development and arrangement of in vari- 

 ous vertebrates, 672 



general characteristics of, 605 



horny, 605 



types of, 605, 607 

 Tela choriodea, 822 

 Tela subcutanea, 556 

 Teledendria, 814 

 Telencephalic vesicles, 822, 823 

 Telencephalon, 822 



Teleost fish, blastoderm of, presumptive 

 organ-forming areas of, 367, Alil 



blastula of, 368 



cleavage and early blastula formation in, 

 322 



development of brain in, 813 



fertilization of egg of, 249 



gastrulation in, 436, 437, 440 



germ ring of, developmental potencies 

 of, 441 



gills of, 639 



origin of periblast tissue in, 324 



spermatogenesis in, 23 



structure of ovary in, 59 



twinning in, 382 



zona radiata of, 165 



Teleostel, xvii 

 Teleostomi, xvi 

 Telosynapsis, 137 



Temperature, and artificial egg activation, 

 219 

 as a factor in reproduction, 46 

 Temporal bone, development of in human, 



695 

 Temporal muscle, 717 

 Tensor tympani muscle, 717 

 Tensor veli palatini muscle, 717 

 Terminal arborizations (teledendria), of 



nerve fibers, 814 

 Terminal ganglia, of autonomic nervous 



system, 837 

 Terminal nerve (cranial n. o.), 827 

 Terminalization, in diakinesis, 139 

 Terrapene Carolina, xix 

 Terrestrial adaptations, of muscles, 706 

 "Test," cells, of Styela egg, 164 

 Testes, 788 



Testicle, use of word, 4 

 Testis, activities of, 22, 34, 47 

 and hypophysectomy, 39 

 anterior suspensory ligament of, 9 

 cryptorchid, 35 

 descent of, 6, 7, 9. 10, 11, 12 

 in bat, Myotis, 7 

 in European hedgehog, 7 

 influence of testosterone in, 12 

 development of, in chick, 794 

 in frog, 794 

 in human, 792 

 in mammal, 792 

 during and after abdominal confinement, 



37 

 factors influencing, 34 

 function and anatomical position, 34 

 and external environmental factors, 43 

 and hypophysis, 39 

 and nourishment, 38 

 and temperature, 34 

 in relation to reproductive ducts, 19, 19 

 lobuli of, 13 

 location of, 6 

 mediastinum of, 13 

 of stickleback, activities in relation to 



seasons, 26 

 of vertebrates in general, 17 

 position of, in flounder, Limanda ferru- 



ginea, 10 

 position of, in sole, 7 

 rete portion of, 16 

 retroperitoneal, 10 

 septula of, 13 

 size of, 17 

 types of, relative to sperm formation, 31 



