482 Chromosomes of Anasa Tristis and Anax Junius 
Fic. 2. Anax junius. <A, B, Spermatogonial groups; ©, metaphase of 
spermatogonial division; D, H, chromosome-groups from follicle cells of 
ovary; F, early stage of growth-period of the male, showing heterotropic (h) 
and plasmosome (p); G, contraction-phase, ‘“ bouquet-stage,’ showing the 
bivalent macro-chromosome; H, I, later growth-period, showing longitudinal 
splitting of chromosomes and the divided heterotropic (h); J, K, L, succes- 
sive stages of the spermatocyte-nucleus, showing condensation of the bivalent 
chromosomes to form crosses. 
