Chimeric adhesive organs produced by xenoplastic ectodermal transplantations betweenBombinator andTriton germs are described. The adhesive organs are very different in the two amphibian groups. The projecting rodshaped balancer of theTriton larva is formed by two epidermal layers and an axial mesodermal core (mesectoderm), while the flat adhesive sucker of the youngBombinator tadpole consists mainly of one epidermal layer of secretion cells. Probably the two organs are either non-homologous, or the homology is partial only. Nevertheless, in the chimeras young balancers are formed, the epidermal layers and the mesectoderm of which are provided in part byTriton and in part byBombinator.