18 



HYDROZOA 



8. Transverse section of a Tubularian polyp near the mouth. (Low power.) Axes of oral 

 tentacles prolonged for a short distance down the body ; ectoderm ; endoderm. 



9. Bunch of female gonophores of Tubularia stained slightly. In ripe gonophores observe 

 umbrella cavity ; rudimentary tentacles ; manubrium with gonad ; embryo in sub-umbrellar cavity. 

 Look out for stages showing development of gonophores. 



