PLATE 4 



EXPLANATION OF FIGURES 



The figures of this plate were drawn from cells found in the testis of Hol- 

 brookia texana. 



37 Equatorial plate view of a dividing spermatogonia. 



38 and 39 Equatorial plate views of first spermatocyte spindles. 



40 Side view of a first spermatocyte spindle. 



41 Telophase of the first division. 



42 and 43 Late anaphases of the first division, showing five chromosomes 

 (large) at one pole and six large chromosomes at the other pole. 



44 Side view of a second spermatocyte spindle, showing the precocious 

 splitting of the chromosomes. 



45 and 46 Equatorial plate views of the second division, showing, respec- 

 tively, five and six large chromosomes. 



47 Late anaphase of the second division, showing five large chromosomes 

 going to each spermatid. 



48 Late anaphase of the second division, showing six large chromosomes 

 going to each spermatid. 



326 



