xin 



PIIVLTM (MIORDATA 



I '.I 



funnels (iist), into the ca^lome ; a short distance from the finincl 

 each gives off a blind pouch, which dilates at the end and forms a 



B 



a-n^ 



WMmA 



p.nph 



p.nph 



p.n.ct 



-ms.Th.aL 



J. 





'///II^ 



y^oTv 



msTX-.tL 



TTtt.TV.d^ 



0.1. bl 



Fir;. 791.— Dingrams illustrating the development of the urinogcnital organs of Craniata. 

 A, development of pronephros and pronephric duct; B, atrophy of pi-onejjhros, development 

 of mesonephros ; C, differentiation of pro- and lueso-nephric ducts ; D, development of nieta- 

 nephros, male type ; E, female type. ul. hi. allantoic bladder ; an. anus ; rl. cloaca ; (joa. 

 gonad ; int. intestine ; m. c. Malpighian capsule ; iiin. a. d. mesonephric duct ; ihk. nph, 

 mesonephros; mt. ■». (!. metanephric duct; mt. npk. metanephros ; nst. nephrostome ; or. 

 ovary; p. n. d. and .«;/. (/. pronephric duct; p. vph. pronejihros ; t. testis; v. e. vasa 

 offereutia. 



Malpighian capsule (w. c), and a branch from the aorta entering it 

 gives rise to a glomerulus. 



