ON KYNOTUS CINGULATUS. 455 
pairs lying in front of the first thick septum (a). Of these, 
the first forms a large “ peptonephridium” lying below the 
pharynx; its duct was traced to the body-wall, which it 
penetrates in front of the second ring, i.e. segment 11 (see 
fig. 6, np.). The second nephridium is also of considerable size ; 
its duct opens between rings 3/4, i.e. at the anterior margin of 
segment m1. The third nephridium lies behind the thin 
septum in segment rv, and its duct was traced to its opening 
between rings 5/6. 
From these facts I conclude, as I have stated above, that 
the second segment is two-ringed; the third is two-ringed ; 
whilst the fourth consists of one ring only (the sixth). 
The following nephridia are all of fairly large size, and 
quite of the Geoscolicid pattern (fig. 23); the more posterior 
ones behind the segment xv are provided with a “ cecum” 
(fig. 24), those more anterior are not. The tubule of the latter 
is spirally coiled, forming corkscrew-like bunches of peculiar 
character. 
The generative system is but insufficiently known in the 
genus. Rosa, who has contributed most to our information 
on the subject, found the testes in segments x and x1, in which 
were masses of spermatozoa free in the coelom, and he traced 
the male duct to the organ in segment xv; I can confirm him 
in both these statements. 
The copulatory organs, whose external features have 
been described above, lie in segments XII, XIII, xIv, and xv 
(fig. 7). In each of the first three segments are paired 
spermiducal glands or prostates (pr.) in connection with sacs 
containing penial chete (p.ch.) The gland is a convoluted 
white tube of considerable size, and in well-developed worms 
extends backwards into the neighbouring segments. Each 
gland is enveloped in a thin sheath of muscle (see fig. 15, 
sh.); its muscular duct receives, just before joining the body- 
wall, the neck of the chetigerous sac or ‘chztophore.” 
This is of considerable size, and has a thick muscular wall; 
it contains three (or four) chete, one of which is much 
longer than the others which appear to be reserve cheetee, and 
