ENDOCRANIAL CASTS OF THE GIRAFFIDAE 349 
only a small portion of the floor of this fossa remains exposed, 
as is shown in the specimen figured. 
The large suprasylvian suleus is fused anteriorly with the 
diagonal and is joined by an offshoot to the splenial sulcus as is 
usual in pigs. The latter sulcus however in this specimen is 
not joined to the coronal, though such a junction is usual in these 
forms. 
__-S.suprasyly, 
R.post.ss _ - Sees 
Sinha a= 5.COR 
- -S.diag. 
.\.. R.ant.ectosyly 
.post.ectosylv.- - = 
Rip Sa! pe ~.S.presylv. 
12 
/S. suprasyly. 
R.desc.ss.._ 
Snes 
R. post.ss.- - --S.diag 
S.trirad. post.. - - Le Stcor 
R. post. ectosylv.- - 
Fig. 12 Right lateral view of cerebrum of an adult specimen of Cervus vir- 
ginianus. Abbreviations as before. X }. 
Fig. 13 Right lateral view of cerebrum of Sus communis (young adult). 
Abbreviations as before.  X }. 
The presylvian sulcus is both well marked and separate from 
the coronal. On account of the extensive operculation already 
mentioned, the ramus anterior ectosylvii, which is small, appears 
to arise from the rhinal fissure. 
Caudally one extremity of the bifurcated suprasylvian gives 
rise to a branch resembling the ramus descendens suprasylvii, 
but not to be homologized as such. Behind this sulcus lies the 
triradiata posterior. 
The extensive upward prolongation of the ramus posterior 
ectosylvii is an unusual feature in the pig brain. In front of 
this is situated a linear sulcus which is curiously reminiscent of 
the sulcus E of Elliot Smith in the hippopotamus (9, p. 321) 
and it is possible that these sulci may both represent atypically 
