INDEX 



951 



Gadus, codfish, lack of parental care in, 



900 

 Galen, 881 

 Galliformes, xix 



Callus, bird, pectoral girdle of, 689 

 Callus (dotnesticus) gallus, characteristics 

 of egg, site of fertilization, and 

 place of sperm entrance into egg, 

 205t 

 gut structures of, morphogenesis of, 604 

 Galtsoff, P. S., 228 



Gambusia affinis, mosquito fish, sperm sur- 

 vival within female genital tract 

 of, 197 

 egg development in ovarian follicle in, 



915 

 fertilization in, 199 

 intromittent organ of, 755 

 ovarian fertilization in, 197 

 Gamete(s), condition of at fertilization, 

 221 

 cytosomal (cytoplasmic) maturation of, 



124, 145 

 definition, 1 13 

 differentiation of, 124 

 female, activities of in aiding sperm and 

 egg contact, 223 

 characteristics of at fertilization, 221 

 fusion of at fertilization, 234 

 male, activities of in aiding contact of 

 two gametes at fertilization, 228 

 characteristics of, 223 

 nuclear maturation of, 124 

 physiological maturation of, 124, 169 

 specific activities of in fertilization, 223 

 Gametic fusion, important studies of, 214 



in Toxopneustes lividus, 214 

 Gamones, 228 

 Ganglia, 812 



of autonomic nervous system, 837 

 Ganglionic crest (neural crest), 469 

 Ganoidei, xvii 

 Ganoin, 564 



Gasserian (Semilunar) ganglion, 828 

 Casterosteus, male sex hormone produc- 

 tion in, 25 

 Gastraea, theory of, definition of, 347 

 Gastralia, 697 



Gastro-hepatic ligament, 873 

 Gastro-splenic ligament, 766, 873 

 Gastrotheca marsupiata, dorsal brood 



pouch in, 911 

 Gastrotheca pygmaea, dorsal brood pouch 

 in, 911, 916 



Gastrula, 347 



an embryonic form common to all meta- 

 zoan animals, Haeckel's theory 

 of, 347 

 antero-posterior extension of, in Amphi- 



oxus, 403 

 definition of, 390, 391 

 late, a mosaic of specific organ-forming 



territories, 446 

 relationship of to blastula and primitive 

 body form, 393 

 Gastrulation, 281 



definition of, 390, 391 



extension in, 398 



in Amia calva, the bony ganoid, 309, 



310, 444 

 in Amphibia, 355, 406. 411, 444 

 in Amphioxus, resume of, 405 

 in chick, resume of morphogenetic move- 

 ments of cells during, 426 

 in elasmobranch fishes, 441 

 in gymnophionan amphibia, 444 

 in mammals, 431, 435 

 in relation to primitive vertebrate body 



plan, 391 

 in reptiles, 417 

 in teleost fishes, 436, 440 

 two of the main functions of, 447 

 Gastrulative movements, autonomous the- 

 ory of, 447 

 Gastrulative streaming, of entoderm in 



chick embryo, 426 

 Gatenby, J. B., 150 



Gecko (Platydactylus), formation of hypo- 

 blast in, 361 

 Geiling, E. M. K., 884 

 Gemmation, 55 

 Gemmules, 114, 348 

 Generation, spontaneous, 57 

 Geniculate ganglion, of facial nerve, 829 

 Genital ducts, 788 

 Genital ridge (fold), 791 

 Germ cell(s), definitive state of, 113, 117 

 factors determining fate of, 43 

 migration of, 115 



by active amoeboid movement, 120 

 by shifting of tissues, 120 

 in blood stream, 120 

 origin of, 68, 114, 118, 119, 121t 

 primitive (primordial), 117, 772, 791, 

 793 

 effect on developing gonad, 121 

 of Amby stoma, 121 

 position occupied in ovarian cortex, 68 

 primary, 117 

 secondary, 1 17 

 Germ-cell areas, of late blastula and gas- 

 trula, later derivatives of, 534 



