(53) 



nervo tracts oii eitirier siae o"*^' the three uerves arj siii^ froni the 

 axiterior end of the i^a.'i.ir,lion am fiiicis that the.se "run forwards 

 ana outwards aiio' then bend bacicv;ara£r and take a courde to the post- 

 erjor corner o-^ the nood." 



A lateral view o:^ tne hood of Ac tino troctia Specieo, E. , 

 b!ov/s sometimes -^ibers t^atnored to^^etner in trunks but these 

 XiQV3r take the direction as shown by Masterman. They diverj^-s 

 rather regularly aiid end all alon^^ tne eajj;e of tne i.ooa ivisteaa 

 of at the posterior corners of the sa/iie, (Fit,. 37) Tiiey are in 

 no v.'ay associated with the gaiitlioi^^ ai'i^ cto not iiave the etpfear- 

 arjce of being even when tiie hood is turued upward out of its 

 usual position. 



"For several reasons, I believe that the coiriplicatea tracts 



of fibers seen in a su'^face view of a live Actinotrocha Species, 



B. , are not iierve fibers but muscle fibers. "Pirst, maiiy of 



celxs. 

 ti-.em show alon> tneir course nuclei resejublin,^ nuclei of rriUscle, 



Second, cross sections tiirou.^1: tne hood show tuat there is a 

 rather heavy lining/ o-^ muscle fibers v/iiich run in the same j^en- 

 eral direction as ao the fibers shov/n in the surface viev;. Third, 

 tnere is no coiniection between these fibers ana tr.e iierve gan- 

 glion. 



T^Vom ti-.e posterior side of the ganglioxi tv/o tracts of nerve 

 fibers pass out BXid can be traced backward some little distance 



