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W. E. HOY, JR. 



i 1 1 f t I i M i . 

 ) 1 1 I i . 



t ii t i 



i > 



( I I I M I I I , 

 i f I I I I i i . 



Anasa tristis. 21 chromosomes, male type. Fig. i. Spermatogonium. Fig. 2. 

 Cleavage nucleus. Fig. 3. Neuroblast. Fig. 4. Mesoderm. 



chromosomes of approximately the same size at each step in the 

 gradation. 



The spermatogonial chromosomes are short and thick, and the 



