82 



8. The forr-atior of the epdoderm follows rore of the 

 tjT'icrl rethcds described by etschr^Koff. It arises late 

 in the larval life fror thr r.ynrytial T^ass of tissue left 

 i- the interi'^r of the e-bryc after the ser.aration of the 

 ectoderr by resc^lcea. Vhen the cells first reai^rear 



they are crcv;ded together without any '-"efi^ite arrangerert ; 

 finally hey con-e to forir the distinct endcder-al layer, 



9. During the late segrentaticn there is evidence 

 that soTC of the nuclei divide aTitctically. 



10. The rianula beccres attached on the side by nearly 

 its entire length, ard is transfer'^ ed into a roct. 



11. Ihe first hydranth develops fro-- a bud which is given 

 off at about the riddle of the root socr after attachre^t. 



12. The tentacles develop ir^ indefinite whcrls. Fach 

 whrrl has four tentacles. The oldest are nerrest the distal 

 end. In the fully developed hydra- th they have the ar-ear- 

 a-'ce of being scattered rather tha- being arranged in circles. 



