ENDOCRANIAL ANATOMY OF FOSSIL MAMMALS 377 
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23 
Fig. 22. Dorsal view of endocranial cast of Oreodon culbertsoni from the 
Oligocene of South Dakota, showing the modeling of the cerebrum. The entire 
cast measures 67 mm. It displaces 41 ec. of water. See list of abbreviations for 
the meaning of labels. 
Fig. 23 Ventral view of same brain cast. 
