316 THOMAS H. MONTGOMERY, JR. 



EXPLANATION OF PLATES. 



AH figures were drawn with the cameral lucida at the level of the base of the 

 microscope, Figs. 13, 20 with Zeiss apochr. 1.5 mm., oc. XII., the others with Zeiss 

 achr. 1/12 mm., oc. XII. Figs. 1-3, 5, 7-12, 14-19 from a seminal vesicle, Flem- 

 ming's fluid, iron haematoxylin; Figs. 4, 6, 21 from a seminal vesicle, corrosive 

 sublimate-acetic, iron haematoxylin; Figs. 13, 20 from a seminal vesicle, Flemming's 

 fluid, Benda's stain; Fig. 22, from a vas deferens, Flemming's fluid, safranine- 

 gentian violet; Fig. 23, from an oviduct, treated like the last; Fig. 24, from an 

 oviduct, corrosive sublimate-acetic, iron haematoxylin. 



c, centriole. 



5, sphere. 



PLATE I. 



FIG. i. Telophase of second maturation mitosis. 



FIGS. 2-17. Successive stages of spermiogenesis from the seminal vesicle. 

 Fig. 6 is an apical view of the stage of Fig. 5. 



