1046 
shown by Eniniot SmitH in his Egyptians — also distinctly visible 
in fig. 4 — needs not exist in the European who possesses this 
sulcus. But it is even impossible — at all events in the material I 
had to dispose of — in cases where a sulcus lunatus is extant 
always to ascertain a greater extension of the area striata on the 
lateral surface of the brain, than in cases where no vestige of the 
above mentioned suleus is to be found. Of course there is no longer 
question of a limitation in the sense of Smirn; it is an illustration 
of the conservatism of sulei we spoke off above, even of one that 
is destined to disappear. *) 
I have asked myself if there was any connection between the 
existence of a sulcus Innatus on the lateral cortical surface and the 
extension of the area striata at the medial hemisphere-wall, in so far 
as the latter in general is connected with — is dependent upon — 
the direction and the modus of ramification of the sulcus calcarinus. 
No regularity at all could be ascertained in this respect. A suleus 
lunatus can be found with all sorts of s. calcar. I gave already 
examples of two forms. 
I can add as a third, extreme, form a case where sulcus calcari- 
nus and suleus parietooccipitalis are nowhere connected, where a 
superficial euneo-limbie transition-convolution exists at the point of 
the cuneus, exactly as it is found — almost always — in anthropoids. 
The sule. lunatus that was here very evident, showed «// the 
above mentioned characteristics. A more or less “anthropoid” condi- 
tion of the cuneus, caused by variations in the direction of the 
sulcus calcarinus does however, as it seems, not always hold con- 
nection with the existence of a sulcus lunatus. 
In general the existence of a sulcus lunatus is by no means a 
proof of imperfect development of the brain in which it is found. 
In normal Europeans it is decidedly frequently met with, as ELLiot 
Smrrm concluded already from the drawings of others. The examples 
shown by me were taken from idiots, because I found in a compa- 
ratively little material such strong variations at the medial occipital 
surface, each time with distinct sulcus lunatus on the lateral one. 
It seems probable that defective development may often be the cause 
of these deviations in the direction of sulei and convolutions, but with 
regard to the many variations in normal brains it cannot be proved. 
Whether and how — in a definite case — the existence of the 
sulcus lunatus is influenced by such a “defective development” is a 
phenomenon that lies completely beyond the field of our observation. 
Nos In a case of Anophtalmos there existed a beautiful monkey-slit: the area 
striata at the medial brain-surface scarcely reached the occipital pole: calcarina 
extension normal, 
