1045 
ZimHeN') called already attention to the comparative slowness, with 
which in the range of development of mammals sulci change their places. 
In the report that he intends to give (Le.), Ariins Kapprrs 
comes on other grounds to the same but more developed conclusion: 
sulei are more conservative than the neighbouring cortical zônes. 
Where we see in man the area striata extending as far as the 
sulcus lunatus — if the latter is extant -- we may see in it a very 
welcome affirmation of the similarity between suleus lunatus and 
monkey-slit, ascertained by other methods (morphologically), It can 
however not be a point of issue for proving a homology — in the 
way as Error SMITH regarded this fact. 
As far as the extension of the area striata can be mapped out 
macroscopically (with the help of the magnifying glass) (Error Switn’s 
investigation was made in this way) the material of the Brain-Institute 
does not offer uniform indications. It seems that the area striata is 
not always dorsolaterally limited by the sule. lunatus ; this limitation 
is likewise not a sharp one in this sense, that suleus and area n:ust 
join each other without any intervening space (in this respect our 
material corresponds with Bropmann’s Javanese). The type of the 
cellamination offers the same evidence as 
that of the extension of Vicq pb’ Azyr’s 
stripe. Fig. 4 gives a reproduction of the 
latter. It has been made after a section 
somewhat lateral from the place where 
in fig. 1 a dotted line has been drawn. 
The preparation consequently cuts the 
sule. lunatus perpendicularly. The letters 
placed in the figure render a further 
Fig. 4, description almost superfluous. I only 
v=stria Vicq d'Azyr, other draw attention to the slight depth of the 
shortenings as above. 
Sagittal section through the é : ; 
occipital lobe of the idiot D. anthropoids. In man (our material) this 
(vide fig. 1). sulcus shows a very different depth; in 
sule. lunatus, whieh is never found in 
this respect likewise it seems to show all the transitions between 
the anthropoid-like state and its total disappearance from the surface 
of the brain; its extremities (medial and lateral) are most undeep. 
It seems*as if first the hidden convolutions, afterwards their 
bottom is brought to the periphery; the cortex is “smoothed”. 
The immediate connexion between area striata and sule lunatus, 
1) ZiEHEN: Ein Beitrag zur Lehre von den Beziehungen zwischen Lage und 
Function im Bereich der motorischen Region der Grosshirnrinde, mil specieller 
Riicksicht auf das Rindenfeld des Orbicularis oculi, Arch, f. Physiologie 1899,S. 173, 
