SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSUKES 



427 



spl., splenium 



s.t., stria terminalis 



sub., subiculum cornu ammonis 



t.c, tela chorioidea 



t.f., taenia fornicis 



thai., thalamus 



th.r., thalamic radiations 



t.o., tuberculum olfactorium 

 t.p., tuberculum posterius 

 tr.olf., tractus olfactorius 

 tr.op., tractus opticus 

 V.I., ventriculus lateralis 

 v.tr., velum transversum 

 z.l. zona limitans 



am 



Fig. 1 Chelydra serpentina, 2 mm. embryo, median sagittal section of the 

 anterior portion to show the neuropore and adjacent structures. Magn. 52 diam. 



Fig. 2 Chelydra serpentina, 4.5 mm. embryo, sagittal section of head to show 

 neuroporic recess, lamina terminalis and lamina supraneuroporica. Magn. 52 

 diam. The section is median in the anterior region. 



