»^et 





•ffon 



Fig. 151.— Diagrams illuslrating the development 01 the urinogenitai;- organs oi 



Craniata. ' ''-"' 



A 'Dronephros and its duct B, atrophy of proiiepliros, dcveloptnent of meso- 



nephros ; C, differentiation of Wolffian and Miillerian ducts D, development of 



metaneohros, male type ; E, female type. , . . ^ . 



al bl allantoic bladder ; an. anus ; d. cloaca ; gon. gonad ; mt. intestipe ; m. c 



Malpighian capsule ; nn. n. d. mesonephnc (WolfBan) duct ; ms. nfh. meso. 



