Anatomy. — "Further contributions to our knowledge of the brairi 

 of Mj/xine giutinosa.'' Bj^ P. Röthig (Berlin) and C. U. Ariëns 

 Kappers (Amsterdam). fCommunicated by Prof. L. Bolk). 



(Communicated in the meeting of March 28, 1914). 



The former of ns has given a description of the motor roots and 

 nuclei in IMyxine gliitinosa and in some Amphibia in Vol. XVI of 

 these Proceedings (p. 296). 



For Mjxine the topograplij' of the V — VII nuclens andthespino- 

 occipital colnmn has been discussed, and mention was made of the 

 absence of the ejemnscle-nuclei and the motor glossopharyngens. 



For the discnssion of the vagus roots reference was made to 

 further researches not yet completed at that time, which we should 

 accomplish in conjunction. 



It is known tliat the vagus of Myxine glutinosa has caused 

 many difficulties, and l)efore givini^- our own results we wish 

 to review the opinions (tf I'ormer authors, because such a review 

 clearly shows the points which give rise (o dilferent interpretations. 



It is obvious that in doing so we shall be obliged to deal again 

 with other roots of tlie cranial nerves in Myxine. 



The tirst description of the central nervous system of Myxine 

 glutinosa was given by Andf.rs Retzh^s ^), who mentions three 

 nerves of the Oblongata, the Vagus, a nerve of the labyrinth (Table 

 VI 1. c. Fig. 7), a cutaneous branch of this labyrinth nerve (Table 

 VI, Fig. 8) and several branches of the V (p. 397, 400 and 401.) 



After A. Retzius, Johannes Müj-ler ") gave an elaborate description 

 of the origin and periferal course of the cranial nerves in Petromyzon, 

 Bdellostoma and Myxine. For Myxine he gave a description of tlie 

 Trigeminus, Facialis, Acusticus and Vagus (comp. F'ig. 4, 4 and 6 

 on Table III I.e. 1888). 



It is interesting that he mentions a cutaneous branch of the VII 

 (p. 193 1. c. 1838), which still wants aftirmation, specially since 

 Miss Worthington "'') could not tind any but visceral sensory and 



') A. Retzius, Beitrag /Air Anatomie des Ader- und Nervensystems der Myxine 

 Glutinosa (Lin.) (Aus d. Abbandlg. tl. Königl. Schwedischen Akademie der Wissen 

 schaften Jahrgang 1822 H. 2) Meikel's Archiv für Anatomie u. Physiologic 1826 

 S. 38G— 404. 



-) J. Muller, Ueb. d. eigenlümlicfien Bau des Gehörorgans bei den Gyclostomen, 

 mit Bemcrkungen über die ungleiclie Ausbildung der Sinnesorgane bei den 

 Myxinoiden Abhandlg. d. Kgl. Akad. d. Wissensch. Berlin KS37 (25. IV. 1836), 

 und : Vergleichende Neurologie d. Myxinoiden, ibidem, 1838 (15. II. 1888). 



3) J. Worthington: Descriptive Anatomy of the Brain and cranial nerves of 

 Bdellostoma doml)eyi (p. 169) Quart. Journ. Miser. Science Vol. 49, 1906. 



