Fig. 18 Section through cerebral margin in mid-sagittal plane. Ep.R., epen- 

 dymal roof; Lb.c, limbus corticalis; Lb.m., limbus medularis; T.c, taenia cere- 

 bri; Vent.I., cavity of cerebral vesicle. Nos. 1 to 5, cortical lamina?, explanation 

 in text (page 231). X 3.5. 



Fig. 19 Section through cerebral margin in plane of junction of anterior and 

 middle thirds of lateral rim. F.d., fascia dentata: Pl.Ch.L., choroid plexus. 

 Other letters as in figure 18. X 3.5. 



Fig. 20 Section through cerebral margin in plane junction of middle and pos- 

 terior thirds of lateral rim. F.d., fascia dentata; F.h., hippocampal fissure; Fm., 

 fimbria; S.F.d., fimbrio-dentate sulcus; T.f., taenia fimbriae. Other letters as 

 in figure 18. X 3.5. 



232 



