PLATE 5 



Figures 34 to 36, and 42 of Cambarus virilis ; and figures 37 to 41 of Cambarus 



immunis 



EXPLANATION OF B'IGURES 



34 Metaphase, primarj- spermatocyte showing the chromatoid bodies at 

 oi>posite poles; Cambarus virilis. 



35 Ultimate telophase stage of primary spermatocyte, with a chromatoid 

 body in each cell lying in the cytoplasm (fig. 93). These cells are earlj- secondary 

 spermatocytes; cype B; Cambarus virilis. 



36 Resting secondary spermatocyte without any chromatoid bodies; type C; 

 Cambarus virilis. 



37 Metaphase, primary spermatocyte, showing the clump of eight chromo- 

 somes migrating to one pole (fig. 113); Cambarus immunis. 



38 Polar view, primary spermatocyte showing 104 chromosomes, 96 ordinary 

 chromosomes and the group of eight enclosed in a clear vacuole of the cytoplasm 

 (fig. 112) ; Cambarus immunis. 



39 Polar view, primary spermatocyte showing the clump of eight chromosomes 

 within the clear vacuole (fig. Ill); Cambarus immunis. 



40 Polar view, primary spermatocyte, showing 104 chromosomes. The group 

 of eight is indistinguishable from the other chromosomes; Cambarus immunis. 



41 Polar view, secondary spermatocyte, showing 104 chromosomes; Cambarua 

 immunis. 



42 Polar view, seoondary spermatocyte showing 100 chromosomes; Cambarus 

 virilis. 



(J3N 



