260 FRANK B. BEDDAED. 



the ovarian segment; and yet the main part of the organ lies in 

 that segment. 



The apex of the spermatheca cannot be seen on a dissection 

 of the worm, for the reason that it lies embedded in a coelomic 

 sac. Figs. 32 — 34 represent a series of sections showing the 

 relations of the spermatheca to this sac. The sections are part 

 of a series running from behind forwards ; towards the poste- 

 rior end of Segment 14 the end of the spermatheca is 

 seen to lie between two coelomic spaces, which are really 

 continuous, and envelop the apex of the spermatheca as seen 

 a few sections later; in this section the extremity of the 

 spermatheca is seen in transverse section to lie in the middle 

 of the coelomic sac, which is incomplete dorsally : this is, 

 however, merely due to an accidental cut ; the sac is really 

 closed. Round the spermatheca is a mass of tissue which is 

 seen in a later section to be the wall of a second sac lying 

 within the first. The spermatheca is pushed against the 

 wall of this, driving it before it for a little way, but it hardly 

 enters the second sac: fig. 34 is therefore a little exaggerated in 

 this particular; the cavity of the spermatheca does not appear 

 to be continuous with that of the second sac, although I should 

 have preferred longitudinal sections to decide the point ; in any 

 case the character of the lining cells is absolutely different. 

 This second sac which lies within the first is also closed ; 

 it has the same general structure, consisting of two layers 

 of peritoneum, between which are a few fibres of what 

 appears to be muscular tissue; but the lining peritoneum, as 

 shown in fig. 33, is very much thicker, and the cells are larger 

 and rounded. 



In both sacs masses of corpuscles lie here and there within 

 the lumen. 



The outer coelomic sac gradually narrows ventrally, and ulti- 

 mately becomes an extremely narrow tube, which is attached to 

 the spermatheca by the mesentery; it finally becomes continuous 

 with the perigonadial sinus. The general disposition of the 

 female reproductive organs and of these coelomic sacs connected 

 with them is shown in a semi-diagrammatic form in fig. 41. In 



