Some New or Little Known Oligocheta. 35 
begins in segment xvi. It has the merest trace of a typhlosole 
in the shape of a convexity just below the dorsal vessel. 
None of the intersegmental septa of this worm are very 
greatly thickened. Those separating segments viii./ix., 1x./x., 
x./xi., xi./xii., xii./xiii. are somewhat thicker than those which 
follow or precede them. The septal glands are found as far 
back as in the vith segment. 
The testes and the sperm duct funnels, of which there are 
two pairs, lie in segments x.,xi. The sperm sacs are also two 
pairs, occupying segments xi, xi. The two sperm ducts of 
each side pass side by side along the body wall to the neigh- 
bourhood of the atrial pore; they pass to the distal side of 
the muscular duct of the atrium, and penetrate the body wall 
close together, but independently of each other and of the 
atrial duct. The two sperm ducts then become one; in 
longitudinal sections through this region of the body, three 
tubes can be seen in section forming together a triangle, of 
which the apex is nearest to the lateral margin of the body. 
The apex is formed by the atrium; anteriorly is the penial 
seta sac and posteriorly the sperm duct; all three tubes are 
of approximately the same calibre. They finally open on to 
the exterior by a common pore. 
The ovaries lie in the xulith segment. Opposite to them 
are the oviducts, which open externally on to the xivth. 
There are no egg sacs. 
The atria are tubular, as in many other Cryptodrilide. 
They are short, not extending far back from the point of 
opening on to the exterior; this, as has been mentioned in 
describing the external characters, lies in the xviith segment. 
The atria reach back to the end of the xviiith segment. 
As is usual, the atrium is partly glandular and partly 
muscular; it is in fact constructed upon the plan which 
characterises Acanthodrilus and other genera with tubular 
atria. The sac of penial sete, to which reference has been 
already made in describing the sperm duct, contains two or 
three sete. These are longer than the ordinary set, but in 
some instances at anyrate have the same S-shaped curvature. 
The free extremity, moreover, is not ornamented. 
There is only a single pair of spermatotheca. These lie in 
