530 C. JUDSON HERRICK 



EXPLANATION OF FIGURES 



56. Section through the fimbria and nucleus of the commissura pallii posterior. 



57. Section through the commissura pallii posterior. 



58. Horizontal section through the commissura pallii posterior of a 25.2 mm. em- 

 bryo of Sphenodon. Harvard Embryological Collection, series 1490, section 

 341. X 29. 



59. Section 347 of the same series as the last, taken 70 micra farther dorsally. 



