PLATE 3 



All figures from Cambarus virilis 



EXPLANATION OP FIGURES 



19 and 20 Postdiplotene stage; these are pre-tetrad stages. 

 21 and 22 Tetrad formation. 



23 Tetrads transformed into dumb-bells. The centrosomes are migrating 

 to opposite poles and the nuclear well is disappearing; one chromatoid body lies 

 in the cytoplasm near the centrosomes. 



24 Metaphase, primary spermatocyte, (fig. 85) ; the chromatoid bodies lie 

 in the cytoplasm and are migrating to one pole. 



25 Metaphase, primary spermatocyte ; smear preparation, showing chromatoid 

 bodies in the cytoplasm at one pole. 



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