246 FRANK E. BEDDARD. 



sac, as they are in Heliodrilus„ The seminal cells must 

 therefore trust to accident to find their way into the interior of 

 the sperm-sacs. 



There are two pairs of sperm -sacs (fig. 44) in Segments 11 

 and 12. Each depends from the anterior of the two septa which 

 bound the segment by which it is contained. The sperm-sacs 

 are not very large, and are perfectly independent of each other. 

 The sperm-sacs are shaped something like a bean, the hilum 

 being the point of attachment to the septum by means 

 of a short pedicle. The interior of each sperm-sac is divided 

 up by numerous trabeculse into a series of very small cavities, 

 which contain decidedly more gregarines than developing 

 spermatozoa. 



The vasa deferentia present close resemblances to those of 

 Teleudrilus (Rosa, 10). The funnel opens into the sperm- 

 sac, and therefore traverses the septum twice, since the sperm- 

 sacs lie on the posterior aspect of the septa separating 

 Segments 11, 12, and 10, 11 respectively. This is precisely 

 what occurs in Teleudrilus, and I have recently pointed out 

 that in a species of Moniligaster there must be something of 

 the same kind, inasmuch as the funnel projects into the sperm- 

 sac which is attached to the front wall of its segment. Gene- 

 rally when the sperm-sacs are attached in this way the funnel 

 of the vas deferens is not in direct continuity with them, but 

 projects freely into the interior of the segment a little way in 

 front of the posterior septum of the segment. 



The vasa deferentia open in the way that has been 

 described by four rather small funnels completely concealed 

 within the four sperm-sacs. On leaving the sperm-sac the vas 

 deferens is at first a somewhat narrow tube, lined by numerous 

 small quadrangular cells, which are of course ciliated ; the 

 peritoneal covering is slight, and there is no such conspicuous 

 muscular coat as I have figured and described in Eudrilus. 

 Almost immediately the vas deferens widens out exactly as in 

 Teleudrilus, and is sharply bent upon itself, and again 

 traverses the septum ; directly it has passed through the 

 septum it narrows. The wide U-shaped portion of the vas 



