1. Proliferation of lamellar whorls in arcuate neurons of the hypothalamus of castrated and morphine-treated male rats

   • M. T. Price
   • J. W. Olney
   • T. J. Cicero

   OriginalPaper Pages: 277 - 284

2. The ultrastructure of the accessory sex organs of the male rat

   • Erik Dahl

   OriginalPaper Pages: 285 - 296

3. Freeze-etching observations on the characteristic arrangement of intramembranous particles in the apical plasma membrane of the thyroid follicular cell in TSH-treated mice

   • Kazunori Ishimura
   • Hisao Okamoto
   • Hisao Fujita

   OriginalPaper Pages: 297 - 303

4. Gap junctions in hemodichorial and hemotrichorial placentae

   • J. Metz
   • D. Heinrich
   • W. G. Forssmann III

   OriginalPaper Pages: 305 - 315

5. New types of islet cells in a cyclostome, Petromyzon marinus L.

   • Jack E. Brinn
   • August Epple

   OriginalPaper Pages: 317 - 329

6. Structure and function of prothoracic glands and oenocytes in embryos and last larval instars of Oncopeltus fasciatus Dallas (Insecta, Heteroptera)

   • A. Dorn
   • F. Romer

   OriginalPaper Pages: 331 - 350

7. Specific binding of anti-myosin and -actin γ-globulins to the surface of trypsin-dissociated embryonic chick cells

   • I. ap Gwynn
   • R. B. Kemp
   • B. M. Jones

   OriginalPaper Pages: 351 - 358

8. The first optic ganglion of the bee

   • Willi A. Ribi

   OriginalPaper Pages: 359 - 373

9. Fine structure of the corpus luteum of the autografted ovary in the rat

   • J. N. Bagwell
   • H. J. W. Chihal
   • R. D. Peppler

   OriginalPaper Pages: 375 - 379

10. Fine structure of nerve-melanophore contacts in the angelfish Pterophyllum scalare

    • M. Schliwa

    OriginalPaper Pages: 381 - 387

11. Shell attachment in the pond snail Lymnaea stagnalis (L.)

    • Benita Plesch

    OriginalPaper Pages: 389 - 396

12. Direct innervation of the mantle edge gland by neurosecretory axons in Helisoma duryi (Mollusca: Pulmonata)

    • A. S. M. Saleuddin
    • R. M. Dillaman

    OriginalPaper Pages: 397 - 401

13. Mapping of neurons in the gravity receptor system of the octopus statocyst by iontophoretic cobalt staining

    • Bernd-Ulrich Budelmann
    • Heinz G. Wolff

    Short Communication Pages: 403 - 406

14. Myelinated synapse-bearing cell bodies in the central nervous system of Scyliorhinus canicula (L.)

    • B. L. Roberts
    • K. P. Ryan

    Short Communication Pages: 407 - 410