ROY L. MOODIE 
Fig. 18 (1) Right lateral view of the dural cast of the skull of Tyrannosaurus 
rex Osborn, from the Upper Cretaceous of Hell Creek, northern Montana. X 
less than}. All figures published through the courtesy of Professor H. F. Osborn. 
(2) Left lateral view of the brain cast of Diplodocus. X lessthan?. (3) Lateral 
view of the right side of the brain case of Diplodocus. X less than 3. 
REFERENCE LETTERS (1) 
B.sp., basisphenoid 
Cobl., cerebellum 
Cer., cerebral hemisphere 
?Eth., ethmoid 
Fr., frontal 
h', dura mater projection 
h?, dura mater projection 
Inf., infundibulum 
Hh, Tal, (U0, IOV Wo JOE Na, AOU, (renee)! 
nerve roots 
Olf., olfactory tract 
Olf.f., olfactory sac. 
Op.l., optic lobe 
O.sp., orbitosphenoid 
Pa., parietal 
Pit. fos., pituitary fossa 
?P.sp., presphenoid 
Soc., supraoccipital 
ves., region of vestibulum auris 
REFERENCE LETTERS (2) 
B.oc., basioccipital 
Car.in., point where carotid 
passes into pituitary fossa 
ep., ediphysis 
for.mag., foramen magnum 
Fr., frontal 
Inf., infundibulum 
O.sp., orbitosphenoid 
‘anal 
Pa., parietal 
?P.sp., presphenoid 
s.end., saccus endolymphaticus 
S.0c., Supraoccipital 
ves., recessus vestibuli auris. 
J, Uf, UT, VG Va Vi. Exe eae 
cranial nerve roots 
REFERENCE LETTERS (3) 
B.oc., basioceipital 
B.sp., basis henoid 
Car.in., carotid canal 
ex.oc., exoccipital 
Fr., frontal 
f-pin., pineal foramen 
O.sp., orbitosphenoid 
Pa., parietal 
?P.sp., presphenoid 
pit.fos., pituitary fossa 
pr.ot., prootics 
S.en., saccus endolymphaticus 
S.oc., supraoccipital 
ves., recessus vestibuli auris 
Ey TT TT TS Vo 1 Vi eX Nereis 
foramina for exit of the cranial nerves 
