PI.ATE 10 



EXPLAXATIOX OF FIGURES 



94 to 98 Sucoessive .stages iu the mitosis of a secondary spermatocyte con- 

 taining the two chromatoid bodies; here the chromatoid bodies both wander to 

 one pole of the cell. 



99 and 100 Early spermatids with two chromatoid bodies in the cytoplasm. 



101 Mctaphase, second spermatocyte, showing one chromatoid body mi- 

 grating to one pole of the cell. 



102 and 103 Telophase stage, second spermatocyte, illustrating the same 

 behavior of the chromatoid body as that found in figure 101 . 



104 to 100 Division stages of second spennatocyte containing both bodies, 

 in which each migrates to an opposite pole of the spindle. 



107 Early spermatid stage with one chromatoid body. 



108 to 110 Trimorphism of the spermatozoa of Cambarus virilis, showing 

 five-rayed (fig. 108), six-rayed (fig. 109), and seven-rayed (fig. 110) types. 



Ill and 112 Polar view of a metaphase stage, i)rimary spermatocyte division, 

 of Cambarus immunis, showing the group of eight chromosomes in a clear vacuole. 



113 Metaphase stage, primary spermatocyte, Cambarus immunis, showing 

 the grou)! of eight chromosomes migrating to one pole. 



114 Anaphase, primary spermatocyte stage, Cambarus inunuriis, showing 

 the gro\ip of chromosomes at one ])ole. 



648 



