PLATE 3 
EXPLANATION OF FIGURES 
12 Nucleus of unfertilized egg. prior to first somatic division. 
13 One of the first twelve somatic nuclei showing eleven chromosomes. 
14 Cell of an early blastula, showing eleven chromosomes. 
15 Cell in a gastrula stage, with eleven chromosomes. 
16 Cell in a pupa that has testes developed. 
17 Cell of an early blastula showing twenty-two chromosomes. 
1S Cell of an early blastula showing twenty-two chromosomes. 
19 Cell in a gastrula stage, with twenty-two chromosomes. 
20 Cell in a pupa that has ovaries developed. 
21 Division phase of early spermatogonia. 
22 Division preceding the equational division, probably the last spermato- 
gonial division. 
23. The equational division. 
24 Early spermatids. 
25 Spermatid. 
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