Epid.of praeorallobe 



Brain 



Eye pi: 



'ft, 



Blood sinus 



Fig: 2 3. 



19* 



Nerve to Lophophor 



Skin 





I"/ 



Ca?/on! -- 



■^"^^ 



'9. I 







v^ . 3^./'^/>J'^- 



Circum. Oesoph 

 nerve 



/o praeoralldb 



Ganglion cell- 



^■9 



1 1 



Meseiiiery 



Fig; 24 



Ganglion cells 



Fi'bres 





Mesentery^. 



Ope 



Fi9;29 



