(48) 

 As far as I knov/, tno crij.;,iii o ■:"■ vacuo lateu tissue in verte- 

 brates is the reverse of this, tne vacuo liiiatioii be._,iruiiiii, at 

 the c elite'" of the co ra avici travelliu-:, outwara. 



The srecimeiis o f Actino trochae o +" Phoroiiio Sabatieri which 

 1 have examined sraw the stnjcturc of the stoiiiacn diverticulum 

 to he very similar to thjat of the diverticulum in ii;o Actino- 

 trocha Sfecies, B, The diverticulum, hov;Gver, is somev/hat 

 more vacuolated in the former ti.an in the latter but it uoes 

 iiot s^.ov; the peculiar structure which Mastermaii has describea 

 ■'or the "no to cho rd" of the species from St. Aiidrews Bay, 



I fail to see wiiat use li.e Actinctrocha has for any o ri_,ai; 

 of support in the ro*:^ion •>,tii:ire the aivcrticula arf found am 

 it seeriis much more probable tu mo that they have a i^landular 

 fuiiCtion. 



i;5'-Vu'..';s System;- It id {.generally aamittcu, I tiiinK, cik-Uii^ 

 investitiators who have stuaied the anatomy of the Actino t-^cha 

 carftfu'lly teat the creature lias a su.bepiaernal layer of iiervcus 

 tissue , ti:rou,,hout tue body v.iiich is fibrillar in character. 



This nervous tissue assumes the form of quite definite^ 

 tracts in certain parts o "^^ tiie body in Actinotrocha Specieo,E., 

 uju fairly v/ell developed nerves can be said to exi.yt, Tne 

 mo3t conspicuous ones are +-ound in the median dorsal line of 

 the p-'-^crjil hood-as ti.ree aistinct longitudinal Lunalos of 



