ZOOLOGY 



Fig. 37. 



A. Vertical section of ByO/ra. 



1. Ectoderm. 



2. Endoderm. 



3. Mesogloea. 



4. Mouth. 



5. Coelenteron. 



6. Hypostonie or oral cone, 



9 and 9'. Large and small nemato- 

 cysts. 

 10 and 10'. Two tuds in different 

 stages of development. 



11. Ovary. 



12. Single ovum. 



13. Testis. 



7. Pseudopodia of endoderm B. Portion of transverse section througli 



cells. body wall of Hydra, more highly 



8. Flagella of endoderm cells. magnified. 



