946 



INDEX 



Egg( s ) — (Continued) 



transport of — (Continued) 

 in fishes, 202, 907 

 in frog, 201 



oviduct, 907 

 in mammals, 200 

 in Salamandra atra, 202 

 through oviduct of hen, 907 

 types of, 156 



viability of after discharge from ovary, 

 82 

 Egg discharge, factors effecting, in the ver- 

 tebrate group, 80 

 Egg follicle {see Follicle, egg) 

 Egg membrane(s), 901 

 formation of, 903 

 importance of, 903 

 in bird's egg, 906 

 oi Amphioxus, 165 

 of Fundulus heteroclitus, 165 

 of perch, 165 

 origin of, 162 

 primary, 901 



formation and importance of, 903 

 secondary, 901 



formation and importance of, 903 

 tertiary, 108, 901 

 of birds, 905 

 of mammals, 804 

 Egg passage, through oviduct, in reptiles, 



907 

 Egg permeability, loss of before fertiliza- 

 tion, 222 

 Egg pronucleus, influence of in stimulating 

 enlargement of male pronucleus, 

 262 

 Egg protoplasm, influence of in formation 

 of first cleavage amphiaster, 261 

 Egg respiration, low level of at fertiliza- 

 tion, 222 

 Egg secretions, formation of, 223 

 Egg shell, formation of, in bird's egg. 906 

 Egg streak, 239 



Egg transport {see Egg, transport of) 

 Egg water, of Arbacia, 225 

 Ejaculate, single, volume of, 32t 

 Elasmobranch fish(es), blastula of, 320, 

 368 

 cleavage in. 320 



early, 318 

 gastrulation in, 441 

 periblast tissue of, 321 

 sagittal sections of. embryos of, 477 

 seminal vesicles of, 186 

 tubulation of epidermal area in, 476 

 vitelline membrane of, 165 

 zona radiata of. 165 

 Elastic fibers, characteristics of, 657 



Elastic tissue, 657 

 El-Toubi, M. R., 669 

 Emboitement, 57 

 Emboly, 395, 449 



definition of, 394, 396 



in gastrulation, of amphibian, 408 



of Amphioxus, 402 

 processes involved in, 396 

 Embryo, definition of, xi 



secondary, induction of, 411 

 Embryology, biochemical, xii 

 causal, xi 

 chemical xii 

 definitions relative to, xi 

 descriptive, xi 

 experimental, xi 

 Embryonic knob, 303 

 Embryonic membrane(s), fate of, 925 



primary, 162, 904 

 Embryonic mesenchyme, 532 

 Embryonic period, xii 

 Embryonic shield, of reptilian blastoderm, 

 360 

 of teleost blastoderm, 437 

 Embryonic tissue, of chick blastoderm, 319 

 Embryotroph, 921 

 Enamel, of teeth, 605, 611 

 Enamel organ (s), differentiation of, 611 



rudiments of, 609 

 End bud, 471 



growth of, importance of in Amphioxus 

 embryo, 494 

 in vertebrate embryo, 494 

 of chick embryo, definition of, 431 

 End piece of sperm flagellum, 149 

 Endocardial cushions, of developing chick 

 heart, 754 

 of developing mammalian heart, 757 

 Endocardial primordia, 702 

 Endocardium, 748 



of chick heart, 742 

 Endochondral bone formation, 667 

 Endocrine glands, definition, 875 

 embryonic origin of, 875 

 influence of on sex differentiation, 886 

 morphological features of, 875 

 solid, non-storage type of, 876 

 Endocrine secretions, possible influence of 

 on development of definitive body 

 form, 883 

 Endoderm, introduction of word, 347 {see 



also Entoderm) 

 Endo-exocrine glands, 875 

 Endogenous sources, of food for embryo, 



902 

 Endolymph. 851 



of ear. 854 

 Endolymphatic duct, 854 



