MODALITES DE LA DIFFERENCIATION DES CARACTERES SEXUELS SOMATIQUES DE NEREIDIENS (ANNELIDES POLYCHETES).

ABSTRACT

The influence of the age, of the fast and of the temperature with the differentiation of sexual somatic characters has been studied in some Nereids. The sexual somatic characters can be differentiated in Nereis of any age if the cerebral endocrine inhibition of the heteronereidation is suppressed. The supranormal temperatures release prematurely and accelerate the process of the differentiation of these characters; the low temperatures moderate these phenomena without preventing their apparition. The fast do not influence the differentiation of the somatic sexual characters.