ENDOCRANIAL CASTS OF THE GIRAFFIDAE 345 
with the suprasylvian on either side though it is almost so on the 
right. 
The presylvian sulcus becomes evident a slight distance above 
the anterior rhinal fissure. Although it is placed far forward on 
the cerebrum, it is still separated from the coronal by a consider- 
able interval on account of the shortness of the latter sulcus. 
A suleus recalling the carnivor ‘‘cruciatus,’> but not to be 
homologized as such, appears emerging from the sagittal furrow 
and probably represents the upturned termination of the splenial. 
The anterior rhinal fissure is poorly marked as the ventral 
limit of a depressed area, whose dorsal border is formed by the 
frontal operculum of the pseudosylvian fossa. The ramus 
anterior ectosylvil is probably represented by the small notch 
in this operculum some distance behind the origin of the pre- 
sylvian sulcus. 
The pseudosylvian fossa is indicated on the right side by two 
or three small vertical notches, while on the left side the con- 
dition more nearly resembles that which has been described in 
the giraffe. 
The suprasylvian sulcus is very dorsally placed and has a well 
marked, long descending ramus. The area between the pseudo- 
sylvian region and the suprasylvian suleus is furrowed on both 
sides by a well developed arcuate constellation, which is in every 
respect similar to the sulcus bearing the same name in the giraffe 
and the okapi. 
The relations of the caudally placed descending ramus of the 
suprasylvian in this form are such as to support the hypothesis 
put forward in the description of the okapi, viz: that this suleus 
may represent a complex corresponding to the ramus posterior 
ectosylvul, the ramus descendenssuprasylvii and the obliquesulcus. 
The small sulcus occupying the area caudal to the descending 
suprasylvian ramus of this form would thus represent the trira- 
diata posterior of Kappers. 
THE JOURNAL OF COMPARATIVE’ NEUROLOGY, VOL. 25, NO. 4, 
