NERVOUS SYSTEM. VERTEBRATA. 



93 



the cerebellum and exposed by the removal of its free 

 extremity, are a pair of prominent lobes (posterior crura 

 of cerebellum); they are united above the fourth ventricle 

 by a commissure, but otherwise are very similar in aspect 

 to the lobi Iinea3 lateralis of Elasmobranchs. They must, 

 however, be compared with the medullary auricles as they 

 consist entirely of a backward prolongation of the cere- 

 bellum. Behind these, on a level with the exit of the 



Fig. 26. 



OLF.TR. 



CORP.STR. 



TOR. LONG. 



TOR.SEMICIRC 



Brain of Gadus morrhua (dissected). 



vagus from the brain, are a pair of lobes almost contiguous 

 in the mid-line and each indistinctly divided by a longi- 

 tudinal furrow. They give origin to the sensory roots of 

 the facial and glosso-pharyngeal and represent a dis- 

 membered portion of the lobus vagi of Elasmobranchs. 



Behind and to the sides of these lobes are elongated and 

 somewhat irregular excrescences from which arise the 

 sensory roots of the vagus. 



Goronowitsch, Festschr. fiir Gegenbaur, Bd. iii. 1897, 

 p. 14 (Lota). 





