«49 



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EXPLANATION OF THE MARKS. 

 -- Calamus X^ti ' Oliva inferior RffiZffl -- Nucleus 



IT 



WM ' Nucl. -j; \^ _ 



Nucl. 



jST-f- Cervical -^ 



Fig. 3. Union of nucleus dorsalis moto- 

 rius vagi wilh nucleus accessoriï ; shifting 

 of vaguscells in a more ventral level. 



mostly medial, have disappeared 

 in one or two sections, we are 

 struck by the strongly lateral 

 position of the cell group in the 

 direction of nucleus XI on the 

 border of the anterior and posterior 

 horns. Further frontally we see 

 he significance of this, for very 

 speedily the nucleus accessorii 

 appears ^it this place, and we 

 notice in 11 consecutive sections 

 a complete merging of the acces- 

 sorius and dorsal-motor vagus 

 nucleus (fig. 3), such as 1 have 

 shown, though in a lesser degree, 

 in the camel and the lama. In 

 the same region there are also 

 constant cells belonging to the 

 vagus group, which have sunk 

 42* 



