518 FRANK E. BEDDARD. 
it will be noticed that in the case of the 10th segment the 
straight rod is prolonged for a very short distance beyond the 
point where it gives off the coiled tubule (nphr.); this appears to 
indicate a commencing separation between the nephridium and 
that part of it which is metamorphosed into sperm-duct. 
Bergh, as well as Vejdovsky, has noticed that the commenc- 
ing vas deferens is a solid structure which only later acquires 
a lumen; it might be imagined, therefore, that my supposed 
nephridium is nothing more than the solid condition of the vas 
deferens or oviduct ; but the connection with it of a coiled tube 
possessing an intra-cellular lumen and agreeing point for point 
with the nephridia elsewhere negatives this supposition. 
In the 7th, 8th, and 9th segments there are small rudimentary 
funnels attached to the posterior wail of their segments. These 
funnels are not ciliated, and consist of but few cells—indeed, 
the expression “ funnel ” is hardly applicable to them; each 
is, however, continuous with a tube passing through the 
mesentery which is identical in appearance with the 
tube connected with the funnels of Segments 10—13. 
This tube is also solid; it has a thick coating of peritoneal 
cells, and ultimately passes into a coiled tube with an intra- 
cellular lumen. In the 9th segment the straight part of the 
tube (see fig. 11) gives off a branch which perforates the body- 
wall, and nearly, but not quite, reaches the exterior (I traced 
it into the circular muscular layer). In the segments lying 
behind the 13th the same arrangement could be observed, but 
though the septa were perforated by nephridial tubules there 
was nothing that could be called a funnel upon the opposite 
side, only a few cells presenting an irregular arrangement. 
It seems to me impossible to avoid the conclusion that these 
structures correspond from segment to segment, and that there- 
fore the funnels of the sperm-ducts and oviducts, as 
well as the commencement of the ducts themselves, 
are formed out of a section of the nephridia of their 
segments. In describing the development of the nephridia 
I have mentioned that the nephridial funnels and the tube 
which is immediately connected with them very soon become 
