38 Proceedings of the Royal Physical Society. 
series are quite twice as thick as the body wall in their 
immediate neighbourhood. 
The alimentary canal is chiefly remarkable for the total 
absence of gizzard and calciferous glands. Almost imme- 
diately after it leaves the pharynx, the cesophagus widens 
out; in the viith segment it narrows; it is again dilated in 
the xith and xiith segments. The intestine begins in the 
xvth segment. 
In the anterior segments of the body there are quantities 
of floating corpuscles. | 
The nephridia are paired structures, but are not furnished 
with a large end sac; the absence of this has prevented me 
from discovering the external pore. 
The hearts are large and very conspicuous in longitudinal 
sections. There are valves where they open into the ventral 
vessel, but apparently not along their course. The last pair 
of them are in segment xiii. The first pair, showing a 
specially enlarged condition, are farther forward than is 
usual, viz., in segment ix. Underneath the intestine and 
cesophagus is a vessel which receives blood from its walls 
and has the same relation to it thus far below that the supra- 
intestinal has above; I have not made out its relations, if 
any, to the other longitudinal trunks; it seems to correspond 
to the lateral vessels of other earthworms. 
The testes are two pairs, lying attached to the anterior 
circle of segments x., x1.; each is broader at the base and 
tapers towards its free extremity. Opposite to the testes 
are the funnels of the sperm ducts. The two sperm ducts 
of each side of the body fuse early to form a single tube, 
which seemed to me to be of unusual thinness; it runs in 
the somewhat thick layer of peritoneum which covers the 
ventral body wall towards the xviiith segment. It opens 
into the atrium at some little distance from the external. 
aperture of the latter. The atrium has the tubular form 
found in so many Cryptodrilide; it is also, as is usually 
the case, divisible into a glandular and a muscular section; 
the glandular part lies chiefly in segments xviii. and xix. 
A number of. muscular strands are attached to the integu- 
ment just at the aperture of the atrium, which they 
