36 



CHARLES R. ESSICK 



Portfis 



In Ponlis 



Figs. 4 to 7 Camera lucida tracings of sagittal sections through the rhomben- 

 cephalon of human embryos from Prof. Mall's collection. The nucleus facialis 

 (Nu. vn) has been dotted in by profile reconstruction. 



Fig. 4 33 mm. fetus. X 9.5. (No. 145, si. 19, sect. 3). 



Fig. 5 35 mm. fetus. X 9.5. (No. 199, si. 37, sect. 1). 



Fig. 6 50 mm. fetus. X 7.2. (No. 96, slide 48). 



Fig. 7 115 mm. fetus. X 7.7. (No. 219, si. 40, sect. 4). 



