1. Bawa, S. R.: Electron microscope study of spermiogenesis in a fire-brat insect, Thermobia domestica (Pack). J. Cell Biol. 23, 431?446 (1964).
2. Bayer, E.: Hypodermis und neue Hautsinnesorgane der Rhynchobdelliden. Z. wiss. Zool. 64, 648?696 (1898).
3. Behnke, O.: A preliminary report on ?microtubules? in undifferentiated and differentiated vertebrate cells. J. Ultrastruct. Res. 11, 139?146 (1964).
4. Bradke, D. L.: Membranous modifications for intracellular transport of secretory product. Abstracts of the 2nd Annual Meeting of the A.S.C.B. 22, 1962.
5. ?: A unique invertebrate photoreceptor. In: Electron microscopy. Proceedings of the 5th Internat. Congr. for Electron Microscopy, vol. II: R-5. New York, Academic 1963.