(50) 

 to tracf; the latter. The sensory papilla mentiouea in the de- 

 scription of the Actinotrocha Species, E. , is absent in this 

 speci es. 



I ata pleased to be able to confirm, to aoriie extent, llas- 

 terman's (15) description of the nervous system of the Actin- 

 otrocha, especially since a. snaaov; of doubt has been cast upon 

 his v^ork by some v.ho have studied the Actinotro cha. 



P3,rtly because Species, E. , seems to be a much rr.o re hii:h- 

 ly developed Actinotrocha ti;an Species, A,, and partly because 

 of its similarity to the one tj;at Mastermaui studiea (v.i.ich is 

 of 30 m'.ich tiieoretical interest) 1 shall confine the descrip- 

 tion Bjtid figures to the nervous system o f Speci es , E. , al- 

 though I am convinces that this Actinotro cli a is ViO t that o '^ Phc- 

 ronis architecta but of an adult that has not beeii discovered. 



I must admit ti.at I have bcon very unsuccassfi.il in the at- 

 tempt to study the nervous system of the Actinotrocha by means 

 of methylene blue ana aiimionium molybdate. Gola chloride jias 

 f.^i ven me no better results thati stainin^,, with iron haematoxylin. 



If the dorsal surface of the hood of a live Actinotrocha 

 Species, B. , be examined one will fina that tr-.ere are a threat 

 many fibers which run in more or less definite tracts, (T^ig. 36) 

 Many of these fibers have nuclei alon(, their course and are un- 

 doubtedly muscl&v fibers v/hile others run to the ed^^e of the 



