PLATE 4 
EXPLANATION OF FIGURES 
Complexes from individual 980 (an atypical animal) 
31 First spermatocyte metaphase with the normal number of chromosomes. 
32 First spermatocyte metaphase with the extra dyad (S). 
33 First spermatocyte complex with the extra tetrad (S). 
34 to 39 Second spermatocyte metaphases of from twelve to fourteen dyads. 
40 and 42 Spermatogonial metaphase complexes each containing the homol- 
ogous pair of extra dyads (S). 
41 A spermatogonial complex with the supernumerary (S) present in 
triplicate. 
434 
