PLATE 2 
EXPLANATION OF FIGURES 
The figures on this and plate 3 are drawn from transverse sections of a series 
of brains of Amblystoma larvae at a magnification of 100 diameters and repro- 
duced at 66 2/3 diameters. 
19 Transverse section through brain of a stage-30 Amblystoma larva. 
20 Similar section of a stage-35 larva. 
21 Similar section of a stage-37 larva just caudad to the velum transversum. 
22 ‘Transverse section of a stage-40 larva. 
23 Transverse section of a stage42 larva just caudad to the velum 
transversum. 
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