3S6 



THE DEVELOPMENT OF THE CHICK 



Fig. 223. — Profile reconstruction of the Wolffian 



duct and primordium of the metanephros of a 



chick embryo of 6 days and 8 hours. (After 



Schreiner.) 



XXV to XXXHT, twenty-fifth to thirty-third 



somites. Al. N., Neck of allantois. CI., Cloaca. 



Int., Intestine. M's'n., Mesonephros. n. T., 



Nephrogenous tissue of the metanephros included 



within the dotted lines. W. D., Wolffian duct. 



Ur., Ureter. 



