(105) 



T..P t'vo siaes of the rint,-lii.e recipient vesdel ao not pasa 

 iiito a siiij.le vessel wiiile u.ey are witi.in the sujradC3ttal cavity 

 (■Pigs. 67 to 71) but after tney have piercea ihe trfujoveroo dop- 

 tvui, the rigl-it side of ti;e riu^, is aeeu tc j^^as^j diat^Oiially across 

 the oesophagus ana to meet the left side of the riijii. CF'itS. 7i3 

 to 7^) 'From this point, the tv.c become oi.o vesdel, tr.e efferent 

 vessel, v;hich runs posteriorly within the left body cavity. 



In the posterior part of the body, v.here the a.limentary ca- 

 nal nai^'es a loop, the efferent aziO. affo'^ent vessels are contin- 

 uous and open into a sinus around the stomach, 



Alon;^ most of the course of the efferent vessel, blood caeca 

 are civen o f^^" and a large bunch also arises fruiu ti:e sinns. 



ITervous System:- We have found that the nervous system of the 

 Actinotrocha is more highly developed in some species than in 

 others ar.d that it is subepidermal in character. In the differ- 

 ent species of the adult, we also find that there is considerable 

 difference in the degree of development of the nervous system 

 and that it is largely subepidermal. 



Caldwell ^5^ was ti.o first to give a gooa descriptor, of 

 ti:e nervous system althou^. Kowalevsicy (11) recognised the ex- 

 istence Of a lateral nerve ana ganglion. Caldwell f.und the 



Of two ciliat.d Pits consisting of nerve cells, ga.^lion and 



