(06) 



scribed as ti-.e "collar nerve rin.J' . ("Fit;. 4k) GanjrlioTi cells 

 are demo-nstrable iu thi« nerve ri Uj. by atainirit deeply with 

 iron haeiratoxylin. (Fii^^,59) Ah 1 siia! ]. aescribe in the ac- 

 count of the muscular sy^item there is a rin;^ of muscle fiber 

 v.-hich ■f'ollows the nerve rin.;. 



Mastennan says that "fibers pass mid-dorsally as a pair 

 Q-^' tracts iiivin^ off branches to the body-wall and terrninatinc 

 in a nervous rin;^; just anterior to the perianal band". Ir his 

 fi^-ures o"^ sections, hov/ever, the pair of tracts ao not siiov; 

 back 0^ the most dorsal pair of tentacles. In Actinotrocna 

 Species, B. , there are no definite tracts 1" nerve fibers nin- 

 nins^ longitudinally from the rei_;ion where the collar nerve rinc 

 passes obliquely downward from the dorsal surface of the collar, 

 llerve fibers are undoubtedly present all alonr the dorsal v/all 

 but these are not massed, together in tracts and are simply the 

 fibers of the ordinary subepidermal nervous tissue. 



The nervous ring in front of the perianal band is rjo t 

 present in the Actinotro chae that I have studied, 



Llasterman (15) finds that part of the nerve rin<^ around 

 the edge of the hood passes up to the nerve gan^^^lion wiien it 

 reaches the insertion of the hood and that numerous fibers also 

 a,ppear to pass on to the ventral surface of the collar region. 

 Live Actinotrochae (Species, A., and Species, B. ) when examined 



