276 MARY T. HARM AN. 



PLATE III. 



FIG. 25. Anaphase of second spermatocyte division showing seven chromo- 

 somes going to each pole. 



FIG. 26. Late anaphase of second spermatocyte division. 



FIG. 27. Telophase of second spermatocyte division. 



FIG. 28. Spermatids. 



FIGS. 29 TO 31. Stages in the development of the spermatozoon. 



FIG. 32. Head and part of the tail of a spermatozoon. 



