PLA TYHELMINTHES 



91 



Fig. 63.— Plan of a Polyclad. After Von Graff. 



1. Brain. 



2. Intestinal branches. 



3. Anterior unpaired branch. 



4. Longitudinal nerve cord. 



5. Mouth. 



6. Oviduct. 



7. Ovarian follicle. 



8. Pharynx. 



9. Pharyngeal pouch. 



10. Stomach. 



11. Testicular follicle. 



12. Uterus. 



13. Vas deferens. 



i . Male copulatory organ, with the 



male aperture behind. 

 5. Female copulatory organ, with the 



female aperture before it. 

 The eyes are omitted. 



