: 1400 
2. One eye, surely resulting from the fusion of two eyes, 
because its structure (8 shaped cornea, double lens, iris, chorioidea 
or retina, finally two separate optic nerves) betrays it immediately 
(incomplete eyclopia). 
3. One eye with one optic nerve, in which the insertion of a 
double set of eye-muscles points to the possibility that it yet can 
be formed by the fusion of two eye-vesicles (complete cyclopia). 
A sample of complete cyclopia has been described in our country 
by Miss Dr. Merman from the laboratory of Prof. W. M. pe Vries. 
The greater majority however of the described cyclopian mis- 
buildings possesses in the single orbit one eye with two optic nerves, 
with the proboscis located above it. 
I bring this to the foreground in order to point out the meaning of the 
word eyelopia, as a circle-eye. The four eye-lids compose around 
the orbit the cirele, in which the two eyes, the double eye or the 
single eye, are lying. The cyclops can be one-eyed, but need not 
be so. However the cebocephalic, and ethmocephalic monstra, being 
arhinencephalie, are related to the incomplete and complete eyclopia, 
which also demonstrate arhinencephalia. Together they form the 
gradually proceeding range of related anomalities, described by sr. 
Hrrarre and VRo ik. 
Apart from the medio-veniral defect at the frontal part of the brain 
and skull, there is however still a second important deformation of 
the brain, appearing in all the monstra belonging to this range. 
On examining the dorsal face of their brains one always finds a 
thinwalled sac, filled with fluid, which is in some cases larger, in 
other smaller, which covers in some cases totally, in others partially 
the brain matter, which does not seem to be divided by a sagittal 
fissure in two hemispheres and is lying at the base of the skull. 
This sac has given rise to much error. Generally the wall of this 
sac is adhaerent to the dura mater and is torn when one is not 
careful in removing the latter, for if the thin membrane, forming 
the wall of the sac, is lost it is only with difficulty found back. 
For certain however it can be stated that if the sac is not found, 
a technical fault is made during the dissecting. 
In all the cases which I examined, it can be pointed out, that this 
sac is the roof of the Ili? ventricle, pushed dorsalwards by the 
fluid, and prominating between the two hemispheres, which are bent 
lateral wards. 
[ cannot approve of the quotation of ScnwaLBE and Josepuy: (Die 
Morphologie der Missbildungen ete. Teil III, IXt® Lief. S. 211. “Das 
“Vorderhirn ist bei den Cyclopen nie in Hemisphaeren geteilt. Es 
