516 C. JUDSON HERRICK 



EXPLANATION OF FIGURES 



23. Transverse section through the brain of Amphiuma in front of the lamina 

 terminalis. After Osborn ('83). X 8. 



24. Transverse section through the brain of a specimen of Amblystoma larva 

 35 mm. long, stained with haematoxylin. X 74. 



The section passes immediately in front of the interventricular foramen, showing 

 the nucleus medianus septi within the corpus precommissurale invading the 

 septum ependymale. 



25. Transverse section through the brain of a specimen of Amblystoma tigrinum 

 larva 32 mm. long, stained with alum cochineal and Lyon blue. X 50. 



The commissura anterior (c.a.) is composed chiefly of decussating fibers from the 

 lateral and medial forebrain tracts. 



