264 



O. LARSELL 



Histological structure 



Histologically, the cerebellum of Amblystoma consists of three 

 layers which may be distinguished by the size of their cells and 

 the relative abundance of their nerve fibers. Two of these 

 layers were recognized long ago by Stieda (75) in the larval form 

 of Amblystoma (Siredon). He considered them to correspond to 

 the granular and the molecular layers, respectively, of the cere- 

 bellum of higher vertebrates. This is in agreement with the 



strmo/. 



caud 



Fig. 4 Horizontal section through part of cerebellum of Amblystoma tigri- 

 num. Series CLXXXV, si. 2, sect. 29. Cajal method. X 125. 



findings of the present writer. To these two should be added 

 in adult Amblystoma a third layer which consists of Purkinje 

 cells. This layer occupies a position between the granular and 

 the molecular layers (fig. 4, str.Pur.) and is composed of relatively 

 large cells which resemble Purkinje cells of somewhat reduced 

 type. 



These layers correspond in a general way to those of the mam- 

 malian cerebellum, not considering the medullary layer of white 

 matter, and will be designated as molecular layer, Purkinje cell 



