Dorsal membrane 

 Spinal cord ' 



Notochord" 

 Aorta • ■ 



Wolffian ducts 



Muscle segments 

 Aorta 



Notochord 

 Dorsal membrane 

 Spinal cord 



Wolffian duct 



Intestine 



Yolk 



Dorsal membrane ' 



Spinal cord - ■ ') /-\ 



Notochord • • ■ 

 Aorta 

 Wolffian body 

 Wolffian ducts- 

 Rectum -(•"■V'V'f "(J 



Pelvic fin 



Notochord 

 Spinal cord 



Dorsal membrane 

 Aorta 



Wolffian ducts (right 



and left) 

 Mesentery (double) 

 Rectum 

 Pelvic fin 





Muscle segment? /.. 



Spinal cord ' £*) 



Notochord 



Aorta 



Caudal vein • 



Bladder 



Rectum 



Ventral membrane -.... 



-■-Notochord 



Spinal cord 

 Dorsal membrane 

 Aorta 



Wolffian ducts 



Bladder 



Mesentery 



Rectum 



Ventral membrane 





1. F. G. 





VI 



