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Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 197

occipitalis is included within the parietal area. Such being the case it
appears to me that the term is singularly appropriate, and should be
preserved on this account as well as on the ground of priority.

It will therefore be understood that I do not agree in any respect with
the following remarks which appear in Pansch's work upon the convolutions
and furrows of the central hemispheres :—" Sulcus parietalis ist die
seiner Zeit von mir gegebene Bezeichnung, die ich heute noch fiir die
einfachste und logisch richtigste halte auch wenn man die Iiblichen Hirn-
lappen annimmt. Das ' intra' ist ein unnothiger Zusatz; keinenfalls aber
liegt eine Veranlassung vor, die Turner'sche Bezeichnung in interparietal
umzuwancleln."* The attack upon Ecker's term, u interparietalis," is altogether
undeserved, because this author has never expressed the desire to
apply that name to the entire system of furrows under consideration. He
only seeks, as we have noted, to give it to one portion of the fissural
system, viz. to the ramus horizontalis.

II. Development of the Intraparietal Sulcus.—The development of
this sulcus affords us one of the most beautiful examples of the interrupted
mode of furrow-formation which is present in the human brain. Further,
as we shall see later on, there appears to be some ground for the view that
in the process of its evolution the disruption of an originally single and
continuous fissure has taken place.

The formation of the intraparietal sulcus in the foetal brain presents so
much variability in different specimens that it is a difficult matter to
decide upon what is in reality the typical arrangement of its several parts.
The details which I give under this head are derived not only from the
examination of the large number of foetal brains in my possession
but also from a study of the masterly memoirs of Ecker,f and Pansch,^

* Die Furchen und Yfiilste am Grosshirn des Menschen, p. 14. Berlin, 1879.

f Ecker, " Zur Entwicklungsgeschichte der Furchen und Windungen der Grosshiru-
Hemispharen im Foetus des Menschen ;" Archly fiir Anthrop.; Dritte Band; Drittes und Yiertes
Heft, 1869.

X Pansch, " Ueber die typische Anordnung der Furchen und Yfindungen auf den Grosshirn-
Heniispharen des Menschen und der Affen," Archiv fiir Anthrop., 1869.