MORPHOLOGY OF ANIMALS 



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FIG. 11. Diagrams of a Flat-worm {Planarian). A, showing gastro-vascular system in 

 black, water-vascular (excretory) system as unshaded tubules ending in flame-cells, muscular 

 pharynx, containing oesophagus, cross-hatched ; B, showing female reproductive organs on 

 left, single ovary at anterior end of oviduct, which receives along its sides vitellaria, or yolk 

 ducts ; testes, numerous shaded spheres on right ; uterus and copulatory organs, posterior 

 to pharynx ; C, showing nervous system consisting of brain at anterior end, two nerve cords 

 running posteriorly through body and giving off numerous lateral branches. (After Hatschek). 



