The cell-boJy app^nrs to have it.? form detamined quit? 

 largely by the lu-nber and iisposLtioa of the denlrites arising 

 from it. It may be roanded, oval, or even triangular in out- 

 line. The lon^^er axis of the cell, vfhile usually perpiniica- 

 lar to the surface of the fold, may be oblique or still farther 

 tilted over from the orientation characteristic of it for the 

 higher vertebrates. 6ven the size of the cell is influenced 

 by its position. The dianeter is greatest in those cells lying 

 at the part of the fold where the side curves abruptly into 

 the summit. On the sides of the fold, the size is remarkably 

 less, and the dendrites pass outward at a wider angle, often 

 causing the cells here to assume a horizontally elongated form. 

 The cell studied by Szczawinska ( '96) evidently vfas of this 

 latter type. 



The internal structure of the Purkinje cell is demonstra- 

 ted less readily with methylen-bliie than is the case for most 

 nerve-cells of Mustelus. In successful preparations, however, 

 the cytoplasm is found to hold tigroid masses of triangular or 

 spindle-shaped form. These bodies are neither large in size 

 nor many in number. There are always several of the greatest 

 diameter arranged near to and concentric with the nuclear mem- 

 brane. The thick bases of the dendrites have small, narrow, 

 lenticular tigroids distributed sparingly as far as the level 

 of tne first great branches. The character and distribution 

 of the tigroid-bodies will be seen by reference to fiig.49. 



The nucleus of the cell lies in a basal position, but it 



