214 C - M - CHILD. 



EXPLANATION OF PLATES. 



PLATE XI. 



FIG. 14. A, B, the dyads grouped about the periphery of the nucleus. M. ex- 

 pansa. 



FIG. 15. Dyads irregularly disposed in nucleus. M. expansa. 



FIG. 1 6. A-C, dyads. M.planissima. 



FIG. 17. Two dyads more highly magnified. 



FIGS. 18, 19, 20, 21. Different stages of first spermatocy tic mitosis. 



FIG. 22. Two dyads in metaphase, more highly magnified. 



FIG. 23. After the first spermatocytic division. 



FIG. 24. Probably resting nuclei after first spermatocytic mitosis. 



