(69) 



iial end. Darkly staiiiin-, dots seen in the luir.en represent 



cross sections of Icn^, flarella sucii as Gooaricii (6) i.as de- 



scriboa in the "solenocytes" of Amphioxus, 



■p'ir. 52(a) shows a section through the liephriaial canal a 



fev/ sections anterior to that of l^'itr.SS and at the same time 



it shows the lower or most posterior branch with a few excretory 



cells and their processes, 

 whi ch i s 

 In Fii-,52(b)^a section trirout,h the tip of the upper or 



BXiter-icr branch of the nephridiun:i, the lumen of the nephridial 

 canal is reduced to a very sji.all clear space. 



If a section is taken in a loii(.,i tudinal direction tiirouv^h 

 the nephridial canal and its excretory processes ( T'l^-. 52 (ij) ), 

 it is seen that ti;e distinct walls of the nephridial canal dis- 

 appear when the "bouquet" of excretory cells is reached but that 

 the end is blind 8.nd that it as merely a thin walled bulb from 

 v<hose sur-^ace radiate the processes of the excretory cells. The 

 St nocture of these processes is the same iii both species tiiat 

 I have examined except that in Species, A., they are ve r/ much 

 shorter, which. xitfl^»f?a»i»Q£ mi i_:ht account for tr.e different ae- 

 scriptions we find in trie literature. 1 am convinced that in 

 both species the excretory processes contain lumens, that ti.eae 

 lumens are continuous with t hje lumen o "*^ the nephridial canal and 

 that they contain flagella. 



