PLATE 3 



EXPLANATION OF FIGURES 



27 Medial section of a model, a young Stage VIII. X 75 



28 Lateral view of same. X 75. 



29 Medial view of a model, an older Stage VIII. X 75. 



30 Lateral view of same. 



REFERENCES 



a. c, anterior commissure 

 ch., optic chiasma 

 dj. mes.f., di-mesencephalic folc 

 hyp., hypophysis 



w. cbl.f., mesencephalic-cerebellar fol 



ot. v., otic vesicle 



r. t., velum transversum 



546 



