(<>7) 



tAe posterioi- ei.c; of tke truixk. 1 caunot say, however, tnat it 

 -as any ontogeiaetic .ii t,ni f i c aiic e . ("Pii:^. 48-44(i ) -44(i-^ ^ I have 

 also founa tue vr-i.tral mesentery to be present in tue Actinc- 

 troci'.a of Phoronis Sal)atieri, 



The veijtral poucn fills a lar^e part of tne trunk cavity in 

 the fully fonrted A.ctinotrocna and just before mc tamo rpvio sis , 

 it frequently puswes tire collar trunk rueaeiitery v/-ell forwaru 

 into ti^e collar cavity, tniis makint, tJr.e stuay of tue relation of 

 tt-e different parts quite aifficult. Bo tr, tr.e external opening 

 of the ventral pouch and tf:e nepj'.riaial openiiij:,3 are found on the 

 ventral v;all o "^ the trunk just pooterior to tiit iiiaor- 

 tioi 0"!" the TTiesentery as in other species, 



IlepiirJ gja;- V/agener (^3) was the first to observe tr.e "ne- 

 pkriaial bouquets" but Calav.'ell (3) was the first to publisn 

 a caref\jl stuay of tue nephriaia of ti.e Ac tino trocha, 



Crooarici; (6) x^as receiitly published a paper on t'-,o excre- 

 tory organs of Ampkioxus aiid rie aads a njt2 un th^. nephriaium 

 uf the Actinc trocha v.l. ich ccnfirras Caldwell's vie\v. The t .."c 



latter investigators agree that the ne;.firiaiuiii ends blinaly v/i th- 



eacii one 

 out funxiels , that there are tubuxa.- pro i;esseo^;;on-ain- n^^ a. 



that tnesc processes 

 lumen ana tipped v/ith aii excretory cell and ^ radiate out from 



the blind inner end o -f the nephriaial canal. 



Iont:,C-'.amps tlZ) is inclines to accept Cald.vell's view of 



