PLATE 4 



EXPLANATION OF FIGURES 



14 Dissection of the brain of a 45-mm. pig. X 6.5 diam. 



15 Wax model of the cerebral ventricles of a 45-mm. pig. X 6.5 diam. 



16 Left lateral ventricle of the model shown in Fig. 15. 



17 Ventral view of the same ventricle. 



246 



