109 
Uebergangswindung sogar bei Cebus hervortreten sehen. Ieh konnte 
gleiches bei einem Papio porcarius constatieren’’. 
From this one may conclude that KonrBruoer too has seen a 
convolution “hervortreten” and this naturally was not his intention 
to write. 
His comparison too, of the ape-fissure with the insula Reilii was 
not a lucky one. We know to be sure (Epincer p. 47) that the 
latter is that part of the developing pallium, which is placed on 
the corpus striatum. By the strong union between these two. it 
remains backwards in growth and causes in this manner the sinking 
down of it. As however such a relation does not exist on the lateral 
surface of the occipital brain, his example of comparison was not 
happily chosen. 
Notwithstanding all this, it is to the credit of Kontpruaer that 
he has come to the conclusion (without the service of embryonal 
material), that the plis de passage primarily ought to have been 
on the brainsurface. 
I already wrote that the view of KonrBruGGe was left unnoticed 
by the investigators, which e.g, is most strongly proved by a communi- 
cation of v. VALKENBURG') published much later, where he writes 
on page 1042 “because part of the transition-convolutions (the first) 
has become superficial”... Further on “If now moreover the 24 
and 3' transition convolutions become superficial i. e. if they pass 
from the bottom of the monkey-slit to the surface of the lob. parietalis”’ .. 
By these views of v. VALKENBURG it is most convincingly proved, 
that the general opinion is still that the 
plis de passage are lying primarily in 
the depth and only secondarily come to 
the surface. 
Turning to the embryonal material, 
which | gathered and often referring to 
my previous communication concerning 
7 the origin of the convolutions at the 
place where the ape-fissure is going to 
(Fig. 2). be formed, we see there that up to 
lre=s. inter parietalis. an embryo of 172 grams, there is no 
m + m/ = s. parieto. occipit. lat. 
w = incisura sulc. par. occ. med. 
b=s. occip. temp. later. seu 
occip. inf. 
question of an apefissure, but that all 
the important sulei on the brain sur- 
face have already been formed (fig. 2). 
1) Van VALKENBURG, C. T., On the occurrence of a monkey-slit in man”. 
Royal Academy of Science. Amsterdam 1913, 
