ENDOCRANIAL ANATOMY OF FOSSIL MAMMALS ate 
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Fig. 13 Dorsal aspect of the artificial endocranial cast of Aenocyon (Canis) 
dirus Leidy from the Pleistocene of the Rancho la Brea beds of southern Califor- 
nia. It will be noted how the overlapping neopallium almost obscures the cere- 
bellum. See list of abbreviations for terminology. The length of the entire 
cast is 96 mm. 
Fig. 14 Left lateral view of same cast. The right side shows the middle 
meningeal arteries more clearly. 
Fig. 15 Base of same cast. 
Fig. 16 Left lateral aspect of the portion of brain, as seen in an artificial 
cast, of the huge saber-toothed cat, Smilodon, from the Pleistocene of the Rancho 
la Brea beds of southern California. Only the posterior two-thirds of the cere- 
brum is shown. The wide space between the cerebrum and cerebellum is exag- 
gerated, due to the difficulty of casting around the rugose osseous tentorium. 
