The finer Anatomy of the Nervous System of Myxine glutinosa. 397 



Addenda. 

 The question of the direct combination between the ganglion 

 cells by direct anastomosis of the protoplasmic processes in Myxine 

 has been dicussed by Nansen (31), who at first thought such a 

 thing possible, but who, in his last communication on the subject, 

 entirely denies such a possibility. While examining CtOlgi prepa- 

 rations for this work, I have seen a few instances where cells have 

 been connected through their protoplasmic processes, but it is doubt- 

 ful if these cells really were nervous. In one Iron-haematoxylin 

 preparation from the caudal end of the Oblongata and in the Cornu 

 anterior, I found two cells, of the same shape as the surrounding 

 nerve cells, joined together as shown in Fig. 24, each cell with its 

 separate cell nucleus. It is of course impossible to prove that these 

 cells are nervous, but it is not improbable, as Haller states that 

 he has sometimes found cells under similar conditions in Salmo 

 which were doubtless of nervous origin. 



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myzon. Zeitschrift für wiss. Zoologie. Bd. XL. 1884. 



2) Untersuchungen über das Gehirn der Petromyzonten. Zeitschrift für 



wiss. Zoologie. Bd. XXXIX. 1884. 



3) Allis, E. Ph., The Cranial Muscles and Cranial and First Spinal Nerves 



in Amia Calva. Journal of Morphology. Vol. XII. 1897. 



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Science. July 1888. 



5) Dkan, B., On the Development of the Californian Hagfish Bdellostoma 



Stouti. Quart. Journ. Mic. Sc. Vol. XL. 



6) On the Embryology of Bdellostoma Stouti. Festschrift zum 70. Ge- 

 burtstag von Carl v. Kuppfbr. Jena 1899. 



7) Edinger, L., Untersuchungen über die vergleichende Anatomie des Gehirns. 



Abhandlungen der SENCKENBERO'schen naturf. Gesellschaft. Bd. XV. 

 Heft 3. 1888. 



8) Die Entwicklung der Gehirnbahnen in der Thierreihe. Verhandlungen 



der Gesellschaft deutscher Naturforscher und Arzte. 68. Versammlung 

 zu Frankfurt lS9ü. Leipzig 1897. 



9) Vorlesungen über den Bau der nervösen Centralorgane. Leipzig. 



10) Fritsch, G., Untersuchungen über den feineren Bau des Fischgehirns. 

 Berlin 1878. 



27* 



