514 C. JUDSON HEREICK 



EXPLANATION OF FIGURES 



18. Section through the rostral end of the thalamus. The pars ventralis tha- 

 lami is bounded above by the sulcus diencephalicus medius (s.m.) and below by 

 the sulcus diencephalicus ventialis (s.v.). A slight sulcus sepaiates its do-sal 

 portion from the ventral, the doisal portion being the eminentia thalami, which 

 gives rise to the nucleus of the commissura nippocampi of Anura. 



19. Section taken 144 micra farther caudad than fig. 18. 



20. Section through the middle of thalamus. 



21. Section through the caudal part of the thalamus and the rostral end of the 

 mesencephalon. 



22. Diagram of the relations of the diencephalic ependymal sulci and compon- 

 ents of the stria medullaris (in brown) in adult Amblystoma tigrinum. The out- 

 lines of the medial sagittal section and of the diencephalic sulci are based on a 

 graphic reconstruction from sagittal sections (X 20). Cf. figs. 8 to 21, drawn to 

 the same scale from transverse sections. The numbers given to the fiber tracts refer 

 to the paragraphs on pages 427 ff . of the text. The decussation of part of the stria 

 medullaris is not indicated. The line A-B indicates the plane of the section 

 shown in fig. 83. 



