Epid of praeoralldbe 





Brain -' 



Ey-s pit 



Rg:2 3. 



Blood, sinus 



NeJVe 

 lo praeoralloVc 



GanglioD cells 





Jit '^^r- Nerve to Lophophor 



14esejitery' \ 



Slin 



rig/om 



''-A//|/#l 



1 





1 - ,'^1^;^?*; ■' 



Fig: 24 



Ganglion cells 



\^ V- 



^i?#' 





'/^^ 



l///,y/MrJ' 



' J 



Mesentery/ 



Filuej 



Fiire. 



Fi^28, 



^^\ ,. 



Lateral muscle 



Ope 



Fig: 29 



