Coryne, a common British longed into a brood pouch conhydroid, produces gonophores; taining embryos.
A, Larva which has just left brood-pouch; B, longitudinal section through a somewhat later stage; C, the fully formed embryo just before fixing - the neo-embryo of Beecher.
Among the Malacostraca some Schizopoda, the Cumacea, Tanaidacea, Isopoda and Amphipoda (sometimes grouped all together as Peracarida) have a marsupium or brood-pouch formed by overlapping plates attached to the bases of some of the thoracic legs.
The male seahorse carries the babies in this species after the female deposits eggs into the male's brood pouch.
