On the nematocysts of Hydromedusae. III

Abstract

The nematocysts of five species of Anthomedusae, six species of Leptomedusae, and one Trachymedusa are described.In view of the additional support supplied by characters of its nematocysts it is suggested that the genus Chromatonema should be placed with Tiaranna in a new family, the Tiarannidae, in the Anthomedusae.Evidence on the possible evolution of microbasic euryteles from stenoteles is afforded by the nematocysts of Aglantha.