FORMATION OF liERM LAVEKS IN ACTINIA IIKRMUI >KN-1S. 54! 



material obtained by washing out the adults, nor did -Actions of 



th.- mr-ri the adult show any segmenting eggs, so the 



[>r<> M-adin.y up to the formation of the Ma-tula cannot be 



: . In the -eetioii represented in 1 u. .>. the Ma-tula 





1). 



.nipleteK formed. l'< cells are very numerous and of pi 



tie.ilK tin- -ame height over the mi in- circumference <>t the 

 lila-tula. llir inti tin- Ma-tllla i- tO a great extent tilled 



with a i ..mparati\. ly thin. li^litK -tainiiiv;. i>la-ma-like matnial, 

 in uhich tlnir are man\ yolk y;ranulr-. 



Tin- maniirr in \\liiih tl.' -ati-'ii "I tin- \olk -|)h-n-- to.ik 



pi. i. r iltninv; tl,' :cntatioii i.m In- o m jiTtmv.l onl> . l-ut, 



from tin- appi-.uaiit of' the u-l ilr-eril >-d it would -n-in 



pii.l.al.N- that, ju-t as in Urticino, tln-n- i- ix-vtT an extensive 



Ma-tula IM\ it \ . I n-trad t In- > -Ik matt-rial i- pn.liaM\ separated 

 lim tin- e\ to|>la-mic portion nf the ft-11- in an carl\ -ta^e of 



^mentation. 



In a lain s | ' Ma-tula ha- ln-i-ume moi, i-l..n- 



i;ati-d. I'lu- i-t-11- ha\t- become relati\-ely thinner, and higher, 

 \\hile at one pole tlu-n- i- the tir-t in<lii\iti< m of the depression 

 that mark.- the lie-inning; of the infolding of one portion ..f the 

 Ma-tula \\all to form the endoderm. 



\\ithin the interior uf the Ma-tula, there has been a marked 

 increase in the relative amount of space unoccupied by nutritixe 



