ABSTRACT
Few studies of an endocrine nature have been made on elasmobranch sexual differentiation and development. injection of steroid hormones (testosterone and progesterone) through the shell membrane into the yolk sac of Scyliorhinus canicula embryos induced both the oviduct and the Wolffian ducts to hypertrophy (Chieffi 1967). After hormone treatment, the Wolffian ducts, which normally atrophy in females, undergo differentiation, change cell structure, and become feminized by a high dose of testosterone (1.0 mg) or progesterone (.02 mg). Injection of estrogen causes hypertrophy of the primordial oviduct in both genetic males and females.
