The head and foot of Pelmatohydra oligactis,pall., as unipotent systems

Summary The head and foot ofPelmatohydra oligactis function in regeneration as unipotent systems. The exact extent of the unipotent tissue immediately posterior to the tentacles and anterior to the foot is not determined in these experiments. The intermediate tissue is pluripotent.The potentiality for head formation is stronger at the oral end and decreases towards the aboral end as the potentiality for foot formation increases.In these grafting experiments the stock has no influence over the graft which retains its individuality.Preliminary account im Akademischen Anzeiger, Wien, No. 24. 22. November 1923: Mitteilungen aus der Biologischen Versuchsanstalt der Akademie der Wissenschaften in Wien, Zoologische Abteilung, Vorstand:H. Przibram. Nr. 113. Kopf und Fuß des Süßwasserpolypen,Pelmatohydra oligactis Pall., als unipotente Systeme vonD. R. R. Burt.