18 A. O. OUDEMANS. 
were more numerous in one and the same transverse section, 
but the bands were much thinner and the lacune reached lower 
down under the intestine than in an older specimen; but they 
never coalesced beneath the intestine. 
In figs. 4 and 24 we still see two other thin longitudinal vessels 
in the cesophageal region. The form of Carinella annulata, 
where this occurs, I have called (see above) the second form. 
These two vessels lie in the proboscidian sheath. They ter- 
minate blindly in three of the four specimens examined, both 
in front and behind. They become visible gradually, not at 
once, and disappear also by degrees. In one of the specimens 
of the second form, I saw at the point where these vessels 
originate a trace of a communication of these vessels with the 
longitudinal blood-vessels, consisting in a pointed diverticulum 
of the blood-lacunz towards the vessel in the proboscidian 
sheath, this point finishing in the hyaline basal layer of the 
proboscidian sheath, whilst the vessel of the sheath had not 
yet a lumen there, but only a little further behind. In a 
second specimen I noticed a space becoming visible above the 
horn of the semi-lunar section of the cesophagus, but lying 
within the cesophageal constrictor muscle. This space seemed 
to me to communicate with the vessel in the proboscidian 
sheath (the latter lying nearly on the same level as the horns 
of the cesophagus), and a few slices more forwards or back- 
wards to communicate with the lateral blood lacuna. It is 
with due reserve that I mention this, the more so because I have 
seen this only on the right side of the animal, and never on the 
left. 
I have stated that the two vessels in the proboscidian sheath 
lie on the same level as the two horns of the cesophagus. In 
the hindmost part I saw one of the vessels going down a little, 
approaching the median line which I have represented as seen 
from above in fig. 4. Similarly, with due reserve, I will 
mention what I have seen in a third specimen of the second 
form, of which I had only a small portion. Five times on the 
left side and twice on the right side, the vessel in the probos- 
cidian sheath sent out a pointed diverticulum through the 
