(49) 



nerve fibers •'xteiiclini.;, from the gaugliou to t no ant ?'-'_'" cut^p" 

 of ti;e nooa. Trie re are other tracts, wnich thouj-^h they are not 

 as definitely marked out as ti:e above, are uacioubtealy nerves. 



Masterifian (15) in nis ..crk gij the anatomy of the Actinotrocha 

 •Tom St. Aaidrews Bay has det-cribed a complicated nervous system 

 kvt tl:e investi t^ations of Houle (20), Ikeda (9) aiia Lon/^champs 

 (12) navo tr;nD\',ii considerable doubt on tne correctness of his 

 observations. Whether these aifferences have been aue to dif- 

 ferences in the Actinotro cr;ae st'^aied by these workers or v.rietn- 



are 

 or tney^ ru'e to the technique it is impossible for me to say, 



but jud<,inr from the difference in the aCf/ree o •*' development tiiat 

 I have found between the nervous system in Species, A. ana Spe- 

 cies, B,, I aiii j.''^u to believe tnat the disagreements are due 

 partly to the fact that no tv/o oP these investigators have stu- 

 died the saraf: species o -^^ A.ctinc t^ocx-.a. 



V/hile the nervous system of Species, A,, can v.'i tr. careful 

 study be shown to be very similar to that of Species, E, , yet 

 it is so feebly developed tr^t '.without first naving studiea Ac- 

 tinotrocha Species, B. , 1 should not have been able to see the 

 sirrdlarity in t.he disposition of the different nervous tracts. 

 The ganijlion witn its three aorsal lonj^l tudinal nerves runnin^j 

 alonj- the median line o ^' tne iioou is easily seen in the live 

 larva of Species,. A., but in sections I have found it impossible 



