266
L. G A L L I E N
FIG. 5. Parabiotic union of Hydra fusca 9 and Hydra fusca d" after regulation. Masculinization is widespread across the two walls of genetically different sexes (H. $* and
H. cf). However, the 9 wall is intersexual (H. φ) and retains among the testicular
structures some ovarian patches. Ov., oogonia; Ovc, oocytes; Sp., testicular swellings.
(After Brien.)
H. viridis. This species is normally hermaphroditic and can be maintained
in a sexual stage all year long at 19°C. Testicular swellings are formed in
the anterior part of the body column, while ovarian patches appear in its
lower part. Thus in the course of a gametogenic cycle the body includes at
the same time three superimposed zones: an anterior male zone, an intermediate female zone, and a blastogenic zone at the base of the body column,
at the level of the basal disc (see Fig. 1). As the polyp grows continuously
L. G A L L I E N
FIG. 5. Parabiotic union of Hydra fusca 9 and Hydra fusca d" after regulation. Masculinization is widespread across the two walls of genetically different sexes (H. $* and
H. cf). However, the 9 wall is intersexual (H. φ) and retains among the testicular
structures some ovarian patches. Ov., oogonia; Ovc, oocytes; Sp., testicular swellings.
(After Brien.)
H. viridis. This species is normally hermaphroditic and can be maintained
in a sexual stage all year long at 19°C. Testicular swellings are formed in
the anterior part of the body column, while ovarian patches appear in its
lower part. Thus in the course of a gametogenic cycle the body includes at
the same time three superimposed zones: an anterior male zone, an intermediate female zone, and a blastogenic zone at the base of the body column,
at the level of the basal disc (see Fig. 1). As the polyp grows continuously