33 
shown in text-figure 9. The marginal 
eyes are further characterized by the 
scarce amount of pigment corpuscles. 
On each side of the median line there 
is a distinet tentacular eye-group 
(text-fig. 10). They can be recognized 
as such through the denser clustering 
of the ocelli, and the full proof is given 
o 
o 
o 0 
o 
Texl-fig. 10. Distribution of cerebral and 
tentacular eyes. The latter are marked 
black. Owing to the contracted and 
folded State of the animal, the left side 
of the picture is inconiplete. The anterior 
border of pharynx, unpaii’ed intestinal 
branch, brain, and uteri are also 
indicated. 24 x. 
XI . _ 
• 
Text-fig. 9. Distribution of eyes. 
a. at the anterior margin of 
the body. b. at the margin in the 
middle pharyngeal region 
of the body. 25 x. 
by the faet that they are more 
superficially located than the sur- 
rounding eyes. Text-fig. 11 shows 
the right tentacular eye-cluster 
with its 14 ocelli ofvarying sizes. 
The openings of the pigment cups 
are turned in dilferent directions. 
In the brain area the eyes are 
numerous without forming two 
quite distinetly separated cerebral 
eye-clusters. Moreover, as scat- 
tered ocelli are found anteriorly 
and laterally, as well as back to- 
wards the pharynx, it is impos- 
sible to strietly distinguish the 
cerebral clusters. Therefore it is 
more correct to say that there are 
numerous eyes distributed all 
over the entire praepharyngeal 
zone, with denser grouping in 
Vidensk. Medd. fra Dansk natin:h. Foren. Bd. 79. 
3 
