ENDOCRANIAL CASTS OF THE GIRAFFIDAE 335 
cular lobes common in ungulates. The large interfloccular mass 
exposed between the caudally diverging cerebral hemispheres 
shows no evidence of division into medial and lateral areas. 
Cerebral hemispheres. Upon the convex cerebral surface of 
the cast, the marks left by the cerebral ridges and digital impres- 
sions are so distinct, that the convolutional pattern may be 
interpreted clearly. 
Dorsally (figs. 2 and 18) the relation of the lateral sulci to the 
suprasylivian are is well shown. The coronal is caudally con- 
nected with the ansate sulcus, a common ungulate condition. 
This ansate sulcus is in no way to be compared with the some- 
what similarly placed cruciate sulcus peculiar to carnivores. 
’ The posterior rhinal fissure (figs. 1 and 3) limiting the pyri- 
form area laterally, is well marked. Rostrally the anterior 
rhinal fissure is not so clearly indicated but may be made out as 
the ventral limit of a depressed area from whose dorsal boundary 
the ramus anterior ectosylvii emerges. 
The presylvian sulcus, rostral to the ramus anterior ectosylvii 
may readily be identified but its continuity with the anterior 
rhinal fissure is not evident. 
In my preliminary report (1.c.) I used Campbell’s term “‘ orbital 
sulcus” together with the term ‘‘paraorbital sulcus”’ to designate 
the ‘‘presylvian sulcus”? and the ‘‘ramus anterior ectosylvii”’ 
respectively. The latter terms are more desirable, as both 
Kappers and Elliot Smith have shown that the so-called ‘orbital 
sulcus” of carnivores and ungulates is not in any way homolo- 
gous to the sulcus bearing this name in primates. Furthermore 
Kappers has pointed out (21, p. 348) that the sulcus termed 
presylvian nearly always represents the caudal boundary of the 
area granularis frontalis and forms a line of demarcation be- 
tween this area and the area giganto-pyramidalis or agranularis 
frontalis. If the term ‘orbital sulcus’ be discarded, it is obvi- 
ous that the term ‘paraorbital’ has also lost its original de- 
scriptive significance, while the term ‘ramus anterior ectosylvii’ 
indicates at once the true relations of this sulcus. 
The diagonal sulcus which is well marked on both sides shows 
no connection with the suprasylvian. 
