(115) 

 lar and trunk. A rim, of muscle fibers run r-arallel with the 

 rin£ nerve between the collar and trunk sei..,ments, Eeside 

 these muscle tracts there is a layer of circular fibers in the 

 wall of the collar and trunk lyin^ between the longitudinal fi- 

 bers and the ectoderm. There is also a covj-intj of ruuscle 

 cells on the ventral pouch, aiid on the wall of the dorsal blood 

 vessel. 



The nephridia have much the saiiie structure as 

 as 

 tJaose of Amphioxus described by Goodrich, In one of the 



Actinotrochae from Beaufort Harbor, the nephridial canal branch- 

 es but in the other, it does not, ITephridial funnels do not 

 exist bT't t,.,,e ends of the canals open into tubular cells and 

 the lumen of each cell contains a flagellum. The nepnridial 

 canals open to the exterior at the sides of the orifice of the 

 ventral pouch. The nephridia which Masterman describes for 

 the preoral hood ana trunk are not present in any Actinotrochae 

 that I have exaimined. 



The blood vessels of the Actinotrocha are formed from the 

 splanchnic mesoaennal linin^: and tl:ey enclose part of the blas- 

 tocoel. There is a dorsal blooa vessel opening (?) anteriorly 

 into the space between the storriach wall and the splanchnic lin- 

 ing;. At the posterior end of the stomach where the dorsal 

 vessel ends, th^ere are caeeal vessels formed as eva^jinations 



