29 



TURBELLARIA 



3. Transverse section of a Planarian, through pharyngeal region (low power : the details to be 

 drawn with a high power). Pharynx ; pharynx-sheath ; epidermis ; enteric caeca ; longitudinal nerve- 

 cords ; testes. 



4. Mesostoma seen as a transparent object with a low power. Cerebral ganglia with two eyes ; 

 enteron ; mouth ; generative opening ; uterus possibly containing winter or summer eggs ; yolk-glands 

 testes ; penis ; ovary ; muscular sac. Under high power notice flame-cells. 



