1. Induction of metamorphosis by bacteria and by a lithium-pulse in the larvae ofHydractinia echinata (Hydrozoa)

   • Klaus -Dieter Spindler
   • Werner A. Müller

   OriginalPaper Pages: 271 - 280

2. Untersuchungen über Dedifferenzierungsvorgänge bei Medusenknospen und Medusen vonPodocoryne carnea M. Sars

   • Volker Schmid

   OriginalPaper Pages: 281 - 307

3. Experimental changes of the cleavage pattern in the eggs of a gall midge (Wachtliella persicariae L.) after local ultrasonic treatment

   • Rainer Wolf

   OriginalPaper Pages: 308 - 313

4. Tentacle morphogenesis in hydra

   • Georgia E. Lesh-Laurie
   • Leminh Hang

   OriginalPaper Pages: 314 - 334

5. The fine structure of the “germinal cytoplasm” in the egg ofXenopus laevis

   • Renata Czołowska

   OriginalPaper Pages: 335 - 344

6. Induction of melanotic pseudotumors inDrosophila melanogaster by juvenile hormone

   • Kornath Madhavan

   Short Communications Pages: 345 - 349

7. Nuclear DNA-like RNA of regions of developing frog embryos

   • R. A. Flickinger
   • J. C. Daniel

   Short Communications Pages: 350 - 352

8. Metamorphosis of imaginal discs of Drosophila melanogaster

   • Géza Mindek

   Short Communications Pages: 353 - 356