AUTHOR S ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, FEBRUARY 23 



THE CEREBELLUM OF AMBLYSTOMA 



O. LARSELL 



Anatomical Laboratories of the University of Chicago and of the University of 



Wisconsin 



TWENTY-ONE FIGURES 



The cerebellum of the Amphibia is recognized as being of very 

 primitive type. This is particularly true of the organ in the uro- 

 deles, in certain forms of which it is said by some authors to be 

 entirely absent. Because of this primitive structure, a compara- 

 tive study of the organ in various representative types of Amphi- 

 bia should prove instructive. Such a study was made by Her- 

 rick ('14), with particular reference to Necturus maculosus, 

 although Amphiuma means and Cryptobranchus alleghaniensis 

 were also included, and some observations were made on the 

 cerebellum of Ambly stoma tigrinum. 



It was at the suggestion of Professor Herrick that the present 

 study was begun. It is a pleasure for the writer to acknowledge 

 his sense of indebtedness to Professor Herrick for his interest and 

 his generosity in making available every facility for the prose- 

 cution of the work, including a wax model of the hind-brain of 

 larval Amblystoma, a series of sketches on cardboard of the brain 

 stem of adult Amblystoma tigrinum, which had been cut to cor- 

 respond with the outlines of the serial sections from which the 

 plots were made, and loans of prepared slides. Acknowledgment 

 should also be made to Dr. Paul S. McKibben for permission to 

 use an extensive series of microscopical preparations, including 

 brains of Amblystoma, both adult and larval, prepared by the 

 Golgi, Weigert, Cajal, and other methods and mounted as serial 

 sections. These preparations were made by Doctor McKibben 

 and are his property. The opportunity to use them has very 

 greatly facilitated the work on the cerebellum. In addition to 

 these, a number of series of sections have been prepared by the 



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