43^ yournal of Cotnparative Neurology and Psychology. 



as far inverted in this animal as it is in Galeus, Mustelus, Scyllium 

 and other sharks. 



Contrary, however, to what is seen in the forebrain, that the 

 eversion ahvays accompanies a reduction of the palaeo-paUium, 

 the nucleus nervi lateralis anterior in Hexanchus is not smaller 

 than in other sharks, or, better, this nucleus in Galeus and other 

 Selachians is not larger than in Hexanchus, being never very 

 large in transverse sections (in comparison with inverted palaeo- 

 pallium forms) so that reduction of its size and a replacing of its 

 function, for instance, by further development of the end-region 

 of the VIII and posterior lateral nerve seems not at all necessary 

 in this case. It is not easy to say which factor exactly has caused 

 this strange position of the nucleus lateralis anterior in Hexanchus; 

 it might be a traction in the lateral direction by the anterior later- 

 alis root, about which, however, we have no certainty. 



LITERATURE CITED. 

 Studnicka. 



Beitrage zur Anatomic und Entwickelungsgeschichte des Vorderhirns der Cranioten. Sitzungs- 

 herkhte der hbhmischen Gesellschaft der IVissenschaften. Mathem.-naturwhsenschajt- 

 liche Classe. 1895, 1896. 

 Nach einige Worte zu meinen Abhandlungen iiber die Anatomic des Vorderhirns. Anat. 

 Anzeiger, Bd. 13. 1898 . 

 Johnston. 



The Brain of .^cipenscr. Fischer, Jena, 1901. 



The ner\'ous system of vertebrates. P. Blakiston's Son & Co., Philadelphia. 1906. 

 Arii^ns Kappers. 



The structure of the teleostean and selachian brain. Journal of Comparative Neurology 



and Psychology, vol. 16. 1906. 

 Untersuchungcn iiber des Gchirn der Ganoiden .Amia calva und Lepidostcus osseus. Abhand- 

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Zur vergleichenden Anatomic der Vorderhirns der Vertebraten. Anat. Anzeiger. Bd. 30. 

 1907. 

 Ariens Kappers (untcr Mitwirkung von Theunissen). 



Die Phylogenesc des Rhinencephalons, des Corpus striatum und der Vorderhirn commissuren. 

 Folia Neuro-biologica. Heft 2, 1908. (W. Klinkhardt, Leipzig.) 

 Allis. 



The cranial muscles and cranial and first spinal nerves in Amia calva. Journal of Morphology, 

 vol. 12. 1897. 



V. KUPFFER. 



DieMorphogenie des Central-nervensystems. (Abdruckaus dem Handbuch der vergleichen- 

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