[Cestode larvae among the planktonic invertebrates of the Atlantic Ocean near the shores of Northwest Africa].

Larval cestodes were described from chaetognaths and some other planktonic animals of the north-west African coastal waters. They are species of the Trypanorhynchidea (Eutetrarhynchus sp.) and of the Tetraphyllidea (Scolex pleuronectis O. F. Müller of uni and trilocular type). Tetraphyllidea are represented also by blastocysts of the family Phyllobothriidae. Life cycles were discussed and specimens of the last group were compared to those of Rio de Janeiro.