32 



MORPHOLOGICAL TYPES 



^3t3ZJJC-3C3 



Aic4?i 



A c'c , mc. n'c. 



Pf- d . a - Be. 



pt. T - pc. dmtaa 



■ / \ ! ^ -r- 



J^rjc^i iL-f^v-— " n n ,L ~^V\ 



V-' P d c ** V 



feft&^gg^l 



I I 



DT. 'pd. D mcl. m 



[Fig. 17.— Method of formation of the kidneys in chordate animals. 



A, early stage showing the cavity of the splanchnoccel (sc) M"™^** 

 with those of the myocoels (tnc) by means of the nephrosis (nc). 1, intes- 

 tine B hypothetical archinephros. The nephrocoels now known as 

 Bowman' s capsules (Be) preserve their connexions with the . jp anc fcnoccd 

 by means of ciliated funnels (,/). From each capsule 1 tubu le Ogrow 

 back and joins that formed from the next posterior c fP s ^%\ so f ^ ed th ^ 

 archineohric duct (ad). With each Bowman's capsule is associated a 

 SoSlu" torfomed from an arteriole from the dorsal aorta (da) and a 



