PLATE 2 



EXPLANATION OF FIGURES 



4 and 5 Fundulus heteroclitus. Fixation: Benda. Stain: Benda. Meta- 

 phase and anaphase of the mitotic division of primary spermatogonia. 



6 Same material. Tertiary spermatogonium. 



7 Same material. Tertiary spermatogonium : metaphase. 



8 Fundulus majalis. Fixation: Benda, without acetic acid. Stain: Benda. 

 First spermatocyte. 



9 and 10 Same material. ^Nletaphase and anaphase of first division of 

 maturation. 



11 Fundulus heteroclitus. Fixation: Regaud. Stain: acid fuchsin-methjd- 

 green. Anaphase of first division of maturation. 



12 Same material. Anaphase of second division of maturation. 



13 to 18 Same material. Six stages of spermiogenesis; in none is the tail 

 represented in its full length. 16 and 17 are respectively face-view and side-view 

 of approximatively the same stage. 



19 Fundulus heteroclitus. Fixation: Benda. Stain: Benda. Group of 

 spermatids in a cyst. 



20 and 21 Fundulus majalis. Fixation: Benda, without acetic acid. Stain: 

 Benda. Spermatozoa from the excretory ducts (the tail is not represented in its 

 full length). 20: side-view; 21: face-view. 



152 



