IN OF GERM LAYERS IN ACTINIA lU-lKMl'IiFN-l -. 343 



<< rilied. \\iihin the ga>trula cavity there have appeared some 

 lev, masses that an- apparently composed of the rather o>ar-e 



granule'- thai come fn.in tin- lux-akin- up of the yolk -phere-. 



In the older v;a-trula. almo-i all of the nutritive material 



lit- within tl. rocoel, only a comparatively few 



ol tin- in .ranule-, re-ultiiu from tlu- di-inu-^ration of 



the >olk ^p! 'niainiiii; in the original 1. la-tula ca\it\ . 





% 



\ 



> 



It 





' 



Apprllo! 1 itioll of the 



Illltlime inal lial dmi: nation I |, ralsGB 



the iiiii--iion . hether the yolk i in the ^a-in* 



alter the in\ !>.ii i- e..nij ill i hat 54 n in 



the Ma-t'M oil- h"\\ the 1 rail-fer 



< on Id take pi.:' . Of 1 il'ililie- in the \\a\ of 3 Uall-fer 



nieiilioii-: In-l that the yolk ini^ht I .e al.-orlied by 



the fell- < -I the ill\ axilla ! i i: ^ !a\ '. all<l then i tO Colled 



iii the . .il and second 1) that the yolk elements pass "-i-h 



dian^eii odd -n the celU of the in- 



inatini: la\er. hi- interpretation, his material 



Mlpport- the la-t mentioned \ie\\ as many of the t ells appear 

 shrunken in diameter \\hile \"lk -pheie- ma\- he >i-en lu-t\\ 

 MU h cell- -eparatiii'c their lateral \\all- one Innn another. He 

 mention- be-ide- that the \\all- at the inner ends of the cell- 

 are I'ften very indi-tinct durini; the time- when this proces- i- 



