The porifera and coelentera . Microhii<h-a and Protohydra. These two forms of uncertain positionneed only brief agree with the hy-droid of Lininocodium inthe absence of Microhydra (Ryder,24) reproduces liy lateral Fio. tbh. Protiihydm Leuckartii, expandiil,coiitrartcd, and in .strobilatioii(after Greef). gemmation, Protohydra (Greef, 24ti)undergoes a process of

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