(44) 

 Tlie ventral v;ali of the hood just as i t t-asaes ivito the 

 wall of the oaaophai>is not infrequently siiov/s a pair of bilat-- 

 erally situated grooves which are similar to those tD una on the 

 ventral collar v/all, 



"Ilour o pore " ;- (Mast .-iiian) Sjj section on the nervous sys- 

 t eia, 



"Su bneu ral Sinu s":- ( Mas t 3 rrnan ) Anc t hv. ?- <j rgaii v;h i c h Mas - 

 tennan (15) has dv^scrib^^u is a sinus irfunoaiat ely belov/ the ner-vG 

 t^anj^lion causea by the v/ant of coxitigiii -.„ c " vaeii tne xnesoblas- 

 tic walls of the preoral cavity and the collar cavity. This 

 sinus, he claims, is closed except for a fissure which leads 

 eventually into the dorsal blood vessel. He compares this si- 

 nus to the heart of Balanoj^lossus. 



Mcnon (19), as far as I kiiow, is the only other worker on 

 the Actinotrocha who claims that there is a aefinite vesicle 

 beneath the gan^-lion and he has discovered no connection be- 

 tween its cavity am the dorsal blooa vessel, 



Roule, Lontjchairips and Ikeda do not find tt-. is on^an, but 

 the latter recognizes tne existence of 5 space ("posterior re- 

 cess") free from mesenchymatous fibers which is the posterior 

 part 0"!" the preoral lobe. This, however, he says, aces no t 

 connect with the aorsal blooD vessel, 



Prom the st?.'ay cf the. early development of Phorcnis archi- 



