82 Journal of Comparative Neurology and Psychology. 



the caudal portion of the hippocampus, and therefore homologous (in 

 part) with the psalterium of the Mammalia, pjut its behavior presents 

 a marked contrast to that of the Mammalia : for, instead of pursuing 

 an extensive forward course to cross over in the lamina terminalis, it 

 avails itself of the primitive direct connection between the caudal lip 

 of the cerebral hemisphere anci the optic thalamus, and in this way 

 reaches the roof of the third ventricle directly." Examination of cer- 

 tain amphibian brains leads the author to conjecture that here the 

 aberrant commissure is represented, not in the dorsal commissure of 

 the lamina terminalis, but in the superior commissure of Osbdrn ! 

 Apparently there is here an interesting problem in cerebral morphology 

 which remains to be worked out in the Ichthyopsida. c. j. h. 



The Homologies of the Cerebellar Fissures. 



Professor O. Charnock Bradley' attacks this intricate prol)lem 

 using a combination of the methods of comparative embryology and 

 comparative anatomy, building upon the foundations laid by Stroud 

 and KuiTHAN. He recognizes that we must not begin by seeking 

 homologues of the human fissures in lower animals; but that, beginning 

 with the smoothest and least complicated cerebellum, the fissural pat- 

 tern should be worked out in the ascending series of mammalian com- 

 plexity. 



The paper opens with a description of the developmental stages 

 of the cerebellar surface in the rabbit, after which comparison is made 

 with other simple adult cerebella ; viz., the hare, shrew, hedgehog^ 

 mole, rat, water-vole, bat and squirrel. The second };art of the paper 

 includes a similar description of the development of the pig, with com- 

 parison with the marten, badger, dog, fox, cat, goat, sheep, cow, 

 horse and donkey. This is followed by a provisional application of 

 the results to the subdivision of the human cerebellum in the light of 

 the comparisons made. The pajier is illustrated by numerous outline 

 figures. 



In a later paper Professor i\. Elliot Smith'-' controverts the author's 

 posit'on regarding the relations of the flocculus, ])araflocculus and 

 vermis, concluding that his views in this regard rest upon insuffi- 

 cient data, in fact upon a (presumably anomalous) hare's brain and are 



' Bradley, O. Charnock. On the Development and Homology of the 

 Mammalian Cerebellar Fissures. Joiirn. Aiiat. mid Physiiil., XXWII, Jan. 

 and June, 1903. 



- Notes on the Morphology of the Cerebellum. Joiiru. Aiiat, anJ Physiol.. 

 XXXVII , July, 1903. 



