Left side 



The pronephros of Chrysemys marginata. 



Embryo C. 



1,16 Ris^ht side 



1,31 



Gut begins 



11 



ear I 



M 



III I 



IV { 



VI{ 

 VII i 



VIII 



IX 



( ! 



?XI 



2,10 

 2,25 



3,4 Foregut ends 

 3,19 

 3,34 

 4,13 

 4,28 

 5,7 

 5,22 



ear 



I 



II 

 III 

 IV 



V 



VI 

 VII 



VIII 



IX 



X 



XI? 



6,1 



6.16 



6.31 



neurenteric ( 

 canal \ 7,4 



(Scale = 3 sections to 1 division) 



