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Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 63

at least probable. But where we are dealing with two shifting points, as
we are in this case, it is extremely difficult to apportion to each its proper
amount of responsibility for the alterations which occur in their mutual
relations. The difficulty is rendered in this case all the greater by the fact
that the changes brought about are of a very slight character.

It would seem likely, although it is by no means conclusively proved,
by the indices in the above Table, that the relative distance between the
parietooccipital fissure and the lambda is greater in the female than in the
male. If this be the case it is quite in keeping with what we have learnt
in regard to the female occipital index. We have noticed that this indicates
a relatively greater length of the occipital lobe in the female cerebrum.

The position of the parietooccipital fissure with reference to the lambda
in the adult head has been very variously stated by different authorities.
Sir William Turner* and Haref place it in front of the lambda ; Broca,%
Bischoff,§ Hamy,|| and Hefftler^J consider that, as a general rule, it
coincides with this point in the cranial wall. Ecker, in one communication
,** states that he found the median end of the fissure 7 mm. in front of
the lambda, and, in another,|f states that the fissure corresponds tolerably
accurately with the lambdoid suture. Fe'rC',^ who examined no less than

* "On the Relations of the Human Cerebrum to the Outer Surface of the Skull and Head,"
Journ. Anat. and Phys., vol. viii., p. 142. Also, "An Illustration of the Eolations of the
Convolutions of the Human Cerebrum to the Outer Surface of the Skull," Journ. Anat. and
Phys., vol. viii., p. 359.

f "The Position of the Pissure of Eolando," Journ. Anat. and Phys., vol. xviii., p. 174.

\ " Sur la Topographie cranio-cerebrale," Eevue d'Anthropologic, 1876.

§"Die Grosshirnwindungen des Menschen," Abhandl. der k. bayer. Akad. der "Wiss.,
11 CI. x. Bd. 11 Abth.

|| "Contribution a l'etude du developpement des lobes cerebraux des primates," Eevue
d'Anthropologic, 1872, p. 424.

\ " Izviliny golovnavo rnozga ou tcheloviekai otnocheniaichk'svodou tcherepa." Dissertation
inaugurale ehirurgicale a l'Acad. med. chir. de St. Petersburg, 1873.

** Archiv fiir Anthropologic, ix. 1876, p. 72.

ff Zur Kcnntniss der Wirkung der Skoliopaedie des Schadels, &c. &c. Braunschweig, 1876,
p. 22.

\\ "Note sur quelques points de la topographie cerebrale," Bull. Soc. Anat., 24 Dec, 1875
(Analyse faite par l'auteur lui-meme).