118 A. OKA. 



it rliffer.s in nothing. The cells of this layer rest on the outside of a 

 tiil)e of basement niem1)rane, which forms the middle layer, and are 

 rather thickly set, every cross section of the tube showing from 

 nine to twelve nuclei. Thus my observations on this organ are 

 identical with and only confirm Nitsche's. Verworn denies the 

 existence of muscular fibres in Cristatdla. In FectinatcUa they are 

 decidedly present, although few in number and isolated, so that tliey 

 are liable t<.) be overlooked if not specially searched for. The outer- 

 most layer is the only cell-layer in the wall of this organ. I cannot 

 l)ut assume that Kra?pelin had fallen into error in describing the 

 funiculus as made up of two cell -layers, the ecpiivalents of the outer 

 ln\er and the lining epithelium of the endocyst respectively. 



The diameter of the lumen is about 0.02 mm., and the thickness 

 of the wall about half as much. 



The narrow lumen of this tubular organ, whose wall must be 

 ivgarded as entirely mesodermal, is bounded at its upper end by the 

 inner cell-layer (entoderm) of the stomach, and at the lower end, by 

 the (Miter layer (ectoderm) of the endocyst (figs. 33 and 34, PI. XIX). 

 It is in this organ that the statoblasts are developed. That the 

 funiculus should not be reg^u'ded as tlie ovary, as was done l)v some 

 former investigators, is self-evident, at least in the present species as 

 well as in those in which a distinct ovary has been demonstrated 

 in quite another region of the.liody. 



9. The part of the Endocyst that 

 produces buds. 



Budding takes place at a, certain fixed position as Braem asserts, 

 namely, at a definite area on the oral side of the cystidal endocyst. 

 Here the endocyst is somewhat thicker than other parts of the same 



