Sur la presence en Mediterranee de la race epitoque de perinereis cultrifera [Polychetes]

The reproduction of Nereid Perinereis cultrifera in the English Channel and the Atlantic is of an epitokous type. The same Nereid in the Mediterranean [Bay of Alger] has been described as atokous [Marcel, 1962] and since that tune epitoky in Mediterranean specimens has been considered to be an accidental phenomenon. However, in the present study polychaetes collected at Salambo [near Tunis] show that those P. cultrifera reproduce exclusively by epitoky

Caracteristiques morphologiques du pharynx de Nereis diversicolor Muller, 1776 [Polychetes Nereidae]

Within the biometrical study of the Nereidae and in order to caracterize the different populations, we looked for the most relevant biometrical characteristics. In fact, for these sea-animals, the weight and length remain just significant statements within certain limit; on the other hand the length of the maxillary, the number of paragnaths which decorate the proboscis can be precisely known

Sur les turbellaries de la lagune de Ghar-el-Melh: recherche du pouvoir de la regeneration chez Monocelis fusca Oersted [Turbellaria, Monocelididae]

The Turbellarian Monocelis fusca Oersted is abundant in the lagoon of Ghar-el-Melh. Traumatic regeneration in this animal is realised for the first time. Transversal sections through two levels of the body are made, and pointed out the presence or the absence of regeneration ability with the considered fragment