PLATE 2 
EXPLANATION OF FIGURES 
13 Amphitene nucleus. Larva 45 mm. 
14 Diplotene stage showing splitting of the thick pachytene threads and their 
separation in the middle. Note attachment at synaptic ends. 
15 Diplotene nucleus. Compare with figures in plates 5 and 6. Larvae 45 
to 60 mm. 
16 Diplotene nucleus showing early formation of tetrads. Larvae 45 to 60 
mm. No evidence of crossing-over. 
17 Condensation of the type of tetrad shown in figure 16. Note the woolly 
appearance. Larva 74 mm. 
18 First spermatocyte tetrads and tripolar spindle. Fourteen tetrads pres- 
ent. First-year tadpole. See figure 79. 
19 Spermatocyte with eighteen tetrads. Very unusual condition. Larvae 
80 mm. total length. 
20 Tetrads of larvae of first year. See plates 9 to 11. Z in figure 20 indicates 
persisting karysomal structure of unknown origin and fate. 
21 Spermatocyte with multiple asters. First-year larvae 40 to 50 mm. total 
length. 
22 Giant spermatid-like body resulting from degeneration of larval sperm- 
atocytes like those shown in figures 106 and 108. See also plate 13. 
23 Different type of spermatid-like body. The black masses represent the 
ring tetrads which have run together. See plate 13 also. Larva 80 mm. 
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