266 C. W. METZ. 



PLATE z. 



FIGS. 13 to 21. <$ Dasyllis grossa; Figs. 22 to 28 5 Dasyllis, species not 

 yet determined. 



FIG. 13. Late prophase, first spermatocyte. 



FIG. 14. Metaphase, first spermatocyte. 



FIGS. 15 AND 1 6. Metaphases, two types of second spermatocytes, the 

 former with X., the latter without it. 



FIGS. 17 TO 19. Examples of the rare cases in which the dense body is 

 represented by two separate smaller bodies. 



FIGS. 20 AND 21. Examples of the chromosome pair with dense body 

 attached, in late prophase. 



FIG. 22. Ovarian cell (oogonium?), prophase showing loose association 

 of middle region of large chromosomes. 



FIGS. 24 TO 28. Chromosomes from oogonia, or early growth stage of 

 oocytes or nurse cells, showing median loops resembling those in the male. 



