232 FRANK E. BEDDARD. 
on Segments xvii—x1x. The middle region of the 18th 
segment is occupied by a protuberant swelling of the body- 
wall, which also extends for a short distance on to the segment 
in front; this lies entirely between the ventral sete. The 
posterior border of this projection appears to be the boundary 
line of Segments xvir1/x1x. Anteriorly, however, the border 
line of Segments xvit/xvilr is seen to end on each side behind 
the anterior part of this protuberant pad. The anterior ori- 
fice therefore lies on the 17th segment, and not on the border line 
between this segment and the one which follows. On the other 
hand, the posterior aperture, which is that of the spermato- 
thecal pouch, is distinctly on the border line of Segments 
xvilt/xtx. The latter orifice appears to be very much smaller 
than the male pore, which has slightly crenated lips. The ventral- 
most seta of Segment xvii is absent on both sides of the body. 
The present species is also remarkable for a median unpaired 
papilla situated upon Segments xxir and xxi. This is oval 
in form, and is flattened with a raised margin. It commences 
at the level of the sete of Segment xxt1, and extends back as 
far as the end of the next segment, the border line of which 
convex backwards. The median region of this segment is, in 
fact, very much wider than that of the neighbouring segments. 
The ventralmost seta of Segment xx1ir lies on the papilla on 
both sides of the body ; on the 22nd segment that seta of the 
left side is upon the papilla. 
Reproductive Organs.—As in other species of the genus, 
Polytoreutus violaceus has only a single pair of testes. 
These lie in the 11th segment ; they are not, however, attached 
to the front wall of their segment, nor are they, as is some- 
times—though rarely—the case with earthworms, attached to 
the posterior wall. They are attached to the wall of the 
sperm-sac, which commences in this segment. It can hardly 
be doubted that originally the testes were attached to the 
front septum of the 11th segment; but the growth ‘of the 
sperm-sac appears to have cut them off from this position, and 
in the adult worm the heart lies between them and the septum 
in question, The testes lie in the proximal end of the sperm- 
