TEETIAliY VEIiTEBIlATA OF THE FATt)M. 
'J’he base of the skull and part of the palate of : A, Fala’omastodon ; B, Elejdias. 
alisphenoid canal ; «7s., alisphenoid ; a.o.f., antorhital foramen; 7;oc., basiocci])ital ; fop., basisphenoid; 
rit., eustachian opening; exo., exoccipital ; foramen lacerum medium;/.?.^)., foramen lacerum 
poster! us ; y.o., foramen ovale ; r/h, glenoid surface for mandible; i.c.c., foramen for inteiaial common 
carotid ; internal nares ; ju., jugal ; m. 2, m. 2, second and third molars ; ph, palatine ; p.p-f., 
I)ostei'ior palatine foramen ; p>P; paroccipital process : pt., pterygoid ; ptij., post-tympanic process of 
squamosal ; st.wf., stylo-mastoid foramen ; fp./i., tym])auo-hyal ; ti/., tympanic ; v., vomer. nat. size. 
form the floor of the inner end of the external auditory meatus. In front of this the 
bone is excavated by the deep fossa referred to above ; this seems to have opened into 
and tlie cxocci])ital, internally by the basioccipital and basisphenoid, and anteriorly by 
the alisphenoid, the foramen lacermn mediam [f.l.m.), and perhaps the pterygoid. 
f'iXternally the bone seems to send a narrow wedge-shaped process between the 
])o.st-tympanic process and the inner end of the glenoid surface, thus helping to 
Text-fig. 49. 
eu 
I [I .h . 
Pl^- 
tn 
1 
hoc. 
