AbstractBy replacing parts of the neural plate (prospective medulla oblongata) ofTriturus vulgarisby neural ectoderm ofXenopus laevislarval chimaeras were obtained, which showed donorlike rhythmical movements of distinct parts of the visceral musculature according to the place of implantation. Especially the branchial region with its external gills showed rhythmical movements and is the special object of this investigation.