240 FRANK E. BEDDARD. 
§ Note upon an Immature Example of this Species. 
From the same locality I have an example of a Poly- 
toreutus which I regard as an immature specimen of P. 
kilindinensis. It measured 98 mm., and consisted of 158 
segments. The external characters, except those afforded by 
the apertures of the reproductive organs, were as in the species 
P. kilindinensis. The reproductive openings were only 
represented by a pore upon the boundary line between Seg- 
ments xvui/xvi1l. This pore was, however, extremely conspicu- 
ous, and showed no indications of being in an immature con- 
dition. Behind the pore was a short transverse groove such as 
exists in the mature worm, but there were no signs of the 
second pore. The internal anatomy, apart from its immature 
state, showed one or two small differences from that of the 
species of which I presume the present example to be an im- 
mature one. There was a thick septum in front of the gizzard, 
which, therefore, separated Segments 1v/v. The dorsal vessel 
also was double, a rare condition in this family. The dorsal 
vessel was formed of two tubes, at any rate in Segments yi11— 
x11. The two tubes became fused at the septa. There are 
other examples beside the present which appear to show that a 
double or a single dorsal vessel is not necessarily a diagnostic 
character of a species. Thus I described the dorsal vessel of 
Megascolex ceruleus as double, while Bourne saw no signs 
of any such doubling. Another point in which the present 
specimen differs from the type of the species is in the fact that 
the two sperm-sacs join together at their distal extremity. 
The median calciferous pouch of Segment x1 was distinctly 
smaller than the two which precede it. 
The sperm-sacs, it should be said, are of precisely the same 
form as in the mature examples; that is, they arise from the 
septum bounding posteriorly the 11th segment. At first each 
sac is thin, and this region extends through one segment only. 
It may, therefore, be pointed out that the probability of this 
shape of the sperm-sacs being characteristic of the species and 
distinguishing it from, for example, Polytoreutus magi- 
