(75) 



Above 1 have given ray opinion that tl:e "subneural sinus" 

 (Masterrrjan) ao es not exist in t tie Ac tino trochae t]:at 1 have ex- 

 ajflinea ana that althou-^h there is a space beneath the ganglion, 

 it has no connection 'Aath tne dorsal bloou vssLiel, 



The blooa vessels of the adult are represented in the Ac- 

 tinotrochae Species, A. anci E, b;' a aorsal blooa vessel CPigs. 

 34-55) extendin^:; alon^: the meaian dorsal line of the int-^stine, 

 from the niesentery between the collar aixa trunk almost to the 

 posterior end of tne s torriach, vvhe re there are small caecal out- 

 pushin^^s of the splanchnic mesoder^ial v/alls o "f' tiie ena of the 

 stoTiiach. This dorsal blooa vessel, althou,,h it is a con.pletely 

 fon^ed vessel, has arisen from a proliferation of the cells of 

 the splanchnic iLesodermal wall along the dorsal meaian line of 

 the stomach and its lumeii is really a part of the bias tocoel, i, e. 

 it is a part o-^* the space between the splanciinic mesoaern.al lin- 

 ing: and the v.'all of tr.e stomach. Posteriorly, tne aorsal blood 

 vessel becomes indefinite and passes into the orainary splaiich- 

 nic mesodermal lining, thus really bein^ open posteriorly into 

 -he space between the wall of the stomach and the inesodermal 

 lining. 



At the time of metarro rphosi s in the Act Jnotrocnae Species 

 A. ana Species, B. , tiiere is no sign of a ventral blooa vessel 

 ■long the stomach, such as Masterman (15) and Houle (20) aescrib^. 



