472 HALBERT L. DUNN 
Fig. 31 A series of curves illustrating the growth of the pons, colliculi, and 
vermis cerebelli by linear measurements. Abscissa: fetal months (crown-heel 
reduced to time by Mall’s convention). Ordinates: lengths of pons, colliculi, 
and vermis cerebelli in em. (Data from formulae in table 43.) I, vermis cere- 
‘bellilength. II, vermis cerebelli height. III, ponslength. IV, colliculilength. 
