60 A. C. OUDEMANS. 
To the Left. To the Right. 
BOUDS AGA BG ic. hep aallie: 55, 56, 57 
a : : : : 57, 58, 59) 60 
62, 63, 64 : 3 : , 62, 63 
— : : : =» 65, 66,67, He 
— ; : : . 65, 66, 67, 68 
— F : ; : 73, 74, 75 
717, 78 ; : : : — 
—- A ; . : 84, 85 
85 : ; : : 85 
_ : : ; : on 
97, 98 : : ; : — 
— ‘ : : P 101 
In No. 110 the nephridial system ceased, and the first genital 
organs became visible. This is the limit then between the 
cesophageal region and the intestinal. We clearly see how 
irregularly even the excretory ducts are arranged. Properly 
speaking, there are only three pairs, the other seems to be 
uneven. I have written in a row the numbers of the slices, in 
which the same duct was to be seen (running obliquely to the 
periphery). Two ducts on the right are twice united by an 
accolade. ‘These are peculiar phenomena not hitherto observed 
by me in other Nemerteans. The ducts 65, &c., in the first 
accolade were parallel to each other (fig. 40), visible on the 
right side of four subsequent sections, and one beneath the 
nerve-trunk. The second peculiarity is this that the ducts 
84 and 85 on the right had one and the same aperture 
through the basal membrane and the skin ! 
15. Amphiporus marmoratus, Hubr., fig. 38. 
The mouth and the proboscidian sheath have a common 
aperture. I could not, however, ascertain to which this aper- 
ture belongs, because the proboscidian sheath was widely stretched 
by the extruded proboscis. The cephalic loop was very distinctly 
visible. It ran above the common aperture, thus also above the 
proboscidian sheath. The two vessels then ran on the sides of 
the proboscidian sheath and the intestine (as in fig. 38). The 
brain-respirators lie beneath them, but do not touch them. 
