A STUDY OF THE ENDOCRANIAL CASTS OF OCAPIA, 
GIRAFFA AND SAMOTHERIUM, WITH SPECIAL 
REFERENCE TO THE CONVOLUTIONAL PATTERN 
IN THE FAMILY OF GIRAFFIDAE 
DAVIDSON BLACK 
From the Anatomical Laboratory, Western Reserve University, School of Medicine, 
Cleveland, Ohio 
TWENTY-FIVE FIGURES 
MEN C LUO. Sats. 2. 2s Ree: ten Seo oneness is ore eer 2g 329 
DESCrIP LION, OLS Pe CIIENS-eae ere ese ces hE eee hae etn wine 331 
(ayeGinathazcamelopardalissenn ties c ito. ecm acts one Jenclaaea tise eee 331 
ib) nO caprarjTohnstoniseawerer ys wah ones cote tevin Ae wets iene eae Mais meee 336 
Kc) geamotheriurn’.<- see tueen mecy eee tee: ee cmt in meer ky woe meee | eae 341 
Types of fissural pattern on the lateral surface of the cerebrum in ungulates.. 346 
DSO VSSINC (0 ork MR UC rad Gi a ok <2 Ee ee NER a Re 352 
(Grova're) MDNSDUo} atea Peer mer rere ieee Bh Sciacca ahi AR a el a NERA ak el EB 355 
INTRODUCTION 
While the skeletal parts and especially the skulls of the 
okapi and giraffe have been carefully examined and compared 
in detail in the effort to determine the relationship of these liv- 
ing forms to one another and to the fossil Giraffidae, no attempt 
has been made to utilize such evidence as may be gleaned from 
a study of the endocranial casts. 
In the present paper an effort has been made to place such data 
upon record in a more detailed fashion than was possible in the 
preliminary notes published as an abstract in the Proceedings 
of the American Association of Anatomists, December, 1914 (3). 
The superficial convolutional pattern of the convex surface 
of the cerebrum in many of the lower gyrencephalous Mammalia 
is quite accurately reproduced by the corresponding irregularities 
upon the internal surface of the skull. This is especially the case, 
329 
THE JOURNAL OF COMPARATIVE NEUROLOGY, vou. 25, No. 4, 
