SH 



INDEX 



Urodela, sex-differentiation, 257, 285 

 thyroid and metamorphosis, 190, 



427 

 tissues and Anuran organiser, 141 



uterus, 177 



vegetative hemisphere, amphibian egg, 



22 

 veins, Lymantria, 172 

 ventral half-embryo, Triton, 52, 53, 



88 f., 89, 240 

 vertebrates, asymmetry, 73 



differentiation, 437 



neural plate, 155 



skeleton, 175 

 visceral skeleton, 31, 394, 395 



viscosity, 105, 108, 123, 126 

 vitelline membrane, 43 



whales, asymmetry, 70 

 winter-buds, Clavellina, 64 

 wrybill-plover, asymmetry, 70 



X-rays, 404 

 xenoplastic grafts, 142 



yolk, 13, 15 f., 



220, 320 

 yolk-nuclei, 40 

 yolk-plug, 17 

 yolk-sac, 327 



30, 35, 40, 67, 94 f. 



