342 ASAJIKO OKA; ON THK SO-CALLED 



suggests the homology of this organ with the segmental organs of 

 worms, especially witli those of Endoproctous Polyzoa. 



Kraepelin (1887), who ntarly nt the same time with Vekavorn 

 published a monograph of German Fresh-water Polyzoa, mentions a 

 o'landular body situated above the base of the epistome, but he wholly 

 denies its excretory nature, saying that, "nn irgend welche Beziehung 

 zu den Exkretionsorganen der Vedicclliun oder gar der Würmer ist 

 wohl um so weniger zu denken, als bei den iilirigen Siisswasser- 

 bryozoen ähnliche Bildungen völlig vermisst werden." 



The account of this organ given by Biiaem (181)0) is very 

 different from the preceding ones. He observed the ciliated tubes 

 mentioned by ^"El{W0RN, hut he attributes to them work of quite a 

 différent nature. To quote his own words : — '* Das gauze Gebilde ist 

 nichts anders als eiue Fijrtsetzung der Loph()[)liorliöhle, welche eben 

 so wie sie in Form des Kingcanales den Piiarynx umgreift, auch das 

 Epistom zu umgelien gen()thigt ist, um auf diese Weise zu den anal 

 über dem Munddeckel befindlichen Tentakel Zutritt zu erhalten." 

 Thus it is clear that this author regards the short tubes as a sort of 

 connecting canal between the right and left halves of the lophophoral 

 cavity, whereas the space left l)etween them is looked upon as the 

 passage to the epist(jmal cavity. Moreovei-, a certain numl^er of 

 tentacles situated near the middle point of the inner margin of the 

 lophophore open into the cavity of these short tubes and are in 

 this way brouglit into connection with the lophoph(3ral cavity like 

 all the rest of tentacles. IjUAEM also denies the existence of an open- 

 ino- by which the cavity comnuuiicates with the exterior. 



In a, paper on Fectinalella (jelatuiosa (181)0) 1 gave a short descrip- 

 tion of this finmel-like structure. The conclusions published there- 

 in are, though of course independently arrived at, exactly the same 

 as those of the preceding author, except as to the external oi)ening. 



