ON KYNOTUS CINGULATUS. 44.9 
are no chetz in the anterior segments of the body ; the first 
cheetze to be recognisable are those on the twenty-sixth ring (seg- 
ment xvr), though in sections I have recognised them in the pre- 
ceding ring. On segments x1II, xiv, xv, the ventral couples 
are replaced by long penial cheetz, which do not project in the 
preserved specimen, but the apertures of the penial sacs are 
seen (fig. 2). The chete are all lateral; the individuals of a 
couple are very close together. The two couples of one side are 
separated by a space of 3 mm.on the clitellum, and in front of 
this space is only 2 mm.; behind it the ventral space, separat- 
ing the right and left inner or lower couples, is 11 mm.!'; the 
dorsal space, separating the right and left outer or upper 
couples, is rather less. 
These cheetz are relatively small, measuring only 0°84 mm. 
(fig. 10); they have the usual shape, and possess a swelling or 
node nearer the freeend. (In K. longus and K. kelleri, to 
which my species presents several points of similarity, the 
swelling is absent and the chetz are smaller.) These chete 
are ornamented, as in some of the other species, by very incon- 
spicuous transverse groups of short lines (fig. 11). Is this 
ornamentation here and in some other cases, where it is so 
simple and ill-defined, a mere wearing away of the surface of the 
cheta, showing the broken ends of groups of fibres of which 
the cheta is composed? In some worms, as in Rhinodrilus 
and Trichocheta, the markings on the chetz are much 
more distinct than in the present instance. Here the “ orna- 
mentation” has to be carefully looked for; and as the tip of 
the cheta is greatly worn down, it is just possible that the 
“ornamentation”? may be the result of wear and tear. On 
the other hand, a similar ornamentation occurs in the penial 
cheetze, which presumably would not be worn down. On the 
clitellum, too, each couple lies in a pit in the epidermis, the 
cheetze themselves not reaching the surface. 
1 These measurements were taken when the body-wall (of one specimen) 
had been flattened out. 
2 The lithographer has emphasised these markings: they should have been 
very much fainter and at the same time more regular, 
