xxiv Journal of Comparative Neurology. 



braten homologisirt werden diirfe. Wir erhalten dann eine sehr 

 eingehende Beschreibung der Ganglienzellen in dem massiven 

 Vorderhirn der Teleostier und eine Schilderung der Fasern, die 

 sich im Wesentlichen mit dem Bekannten deckt. 



Das Werk endet mit einem Excurse iiber die muthmassliche 

 Phylogenie des Vertebratengehirnes. Es fallt auf, dass dem Ver- 

 fasser, welcher im Allgemeinen die Litteratur gut beriicksichtigt, 

 die Arbeiten amerikaniscber Autoren ganz entgangen sind. Vor- 

 nebniHch die Arbeiten besonders von Strong hatte ihm manche 

 Verhaltnisse, so die aufsteigenden Wurzehi z. B. klarer erscbei- 

 nen lassen, auch die Arbeiten der beiden Herrick batten durch- 

 aus verdient angezogen zu werden. 



The Brain of Ornithorhynchug.' 



This paper, preliminary to a more extensive contribution, was 

 called forth by a memoir of Professor Ziehen. 2 Dr. Smith claims that 

 the differences between his results and those of Prof. Ziehen are due 

 chiefly to faulty preservation of the latter's material. Without entering 

 into the merits of this controversy, we would merely call attention to 

 the three figures of the brain of Ornithorhynchus given in this paper 

 as the clearest and most generally useful of any thus far published. 

 Dr. Smith's paper concludes with the following summary. 



It is now possible to state in a concise manner the most 'salient 

 features of the brain in the Monotremata, taking into consideration not 

 only the features discussed in this communication, but in addition those 

 characters which I have previously described. 



We may consider these features under two headings : — (A) in com- 

 parison with other mammals, and (B) in comparison with reptiles. 



A. I. In comparison with the Marsupialia, Insectivora, Cheirop- 

 tera, Edentata, and Rodentia, we must admit that the Monotremata 

 have a large cerebral cortex, the size of which greatly exceeds that of 

 many other mammals, 

 contrast to that which is common to the whole of the Metatheria and 



1 Further Observations on the Anatomy of the Brain in the Monotremata. 

 By G. Elx^iot Smith. Jour, of Anatomy and Physiology^ XXXIII, 1899, pp. 

 309-342. 



''■ Das Centralnervensystem der Monotremen und Marsupialier. I. Thiel. 

 akr. Anat. Scmoti's Zool. Forschungsreisen, iii. Jenaische Denkschrift., vi, 1897. 



