INDKX '275 



Wolffiaii body, atrophic changes of, 241 Yolk nucleus in oocyte, 10 



connexion of pleuro- peritoneal membranes phylogeny of, in mammalian ovum, 27 



with, 180, 241 sac, 28, 33, 35, 53, 59 



Wolffian duct, 177 circulation, 59, 60 



fate of, 192 Young and Robinson, secondary caudal arch 

 Wolffian mesentery, 180, 199 of, 223 



Wolffian ridge, 34, 178, 241 



Wrisberg, cartilages of, 167 ZIEGLER, on origin of blood-vessels, 62 



Zimmermann, on arterial arches, 217 



YOLK, accumulation of, gastrulation modified Zona pellucida, 7 



by, 43 Zonule of Zinn, 141, 143 



amount of, as determining character of Zuckerkandl, gyrus subcallosus of, 124 



egg- cleavage, 9 on chromaffin bodies in human embryo, 



granules in egg- protoplasm, 9 135 



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