1890 - 91 .] Alexander Brace on a Human Cyclops. 
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jaw was normal in form, but projected about in. beyond the 
superior maxilla, apparently owing to the defective development 
of the latter. In the sphenoid bones the greater wings had their 
outer surfaces directed a little more forward than normally. 
The foramen caecum was situated nearly \ in. from the hinder 
margin of the frontal bone. At this point the defective falx 
cerebri commenced as a single layer. Below this point the falx 
had split into two layers directed outwards towards the anterior 
lips of the lesser wings of the sphenoid, including between them a 
small triangular space, into which a small portion of the anterior tips 
of the cerebrum projected. 
III. Description of the base of the skull . — The roof of the 
mouth was formed by the two palatal processes of the superior 
maxillary bones, which united in the normal way in the middle 
line. The palate bones presented a peculiar appearance. Instead 
of being horizontal they were directed obliquely upwards and back- 
wards, and apparently articulated directly with the basi-sphenoid 
bone. The nasal cavity was thus completely absent. The space in- 
cluded between the orbital plates of the superior maxillae above and 
their palatal processes below, between the anterior portion of the 
superior maxillae in front and the palate bones behind, was occupied 
by a large sinus, which was probably the equivalent of the two 
antra of Highmore. The space between the two palate bones and 
the basi-sphenoid and occipital bones was nearly hemispherical, 
with a diameter of about |- in. 
In this case we have to deal with a malformation in which the 
following facts have to be accounted for : — 
1. The fusion of the two eye-lids with each other so as to form 
a single oval aperture. 
2. The formation of two rudimentary eyes in which the lenses 
are separate, while the retina and optic nerve are single. 
3. The absence of certain bones of the face and skull which 
are normally present in the mesial plane. 
4. The absence, or rather displacement with imperfect develop- 
ment, of the nose. 
5. Certain defects of development of the cerebral hemispheres 
and crura cerebri, described above in detail. 
It is obvious that the malformation must have been produced at 
