CENTRAL RELATIONS OF COMPONENTS. 47 



caudad, as the fasciculus communis, into an elongated 

 lobus IX + VII. The latter receives the sensory IX root 

 and is continuous caudad with the lobus vagi. 



Now, the root which Haller calls trigeminus (Plate IV, 

 fig. 26) obviously contains, besides the sensory and motor 

 V, the communis root of the VII and probably also the 

 dorsal lateralis root of the VII, while his root marked 

 ac.-\-fac. contains the ventral lateralis root of VII, the 

 motor VII and perhaps VIII fibres. The portion of the 

 latter complex which he marks fac. is not a sensory 

 facialis root terminating in the cephalic end of the lobus 

 vagi, as Haller supposes, but the motor VII root, which 

 passes out from its nucleus via the fasciculus longitu- 

 dinalis dorsalis, exactly as in Menidia. 



The root which Haller calls the " obere innere Ramus 

 ascendens n. trigemini (r. a. tr. siip.y and considers as a 

 root from the cephalic end of the lobus vagi is the com- 

 munis root of the facialis, i. e. , the fasciculus communis. 

 Its terminal nucleus, the lobus VII+IX, is continuous 

 with the lobus vagi, and it is not true that the latter " is, 

 accordingly, not sharply defined forward, but is continued 

 without interruption into the upper or sensory trigeminus" 

 (p. 64) ; for none of the centres in question have anything 

 whatever to do with the trigeminus. 



Haller supports the serial homology of the lobes from 

 which the V, IX and X nerves arise by citation of the 

 case of Lota vulgaris, but upon comparing the figure 

 given with a similar figure of the same species by Gorono- 

 witsch in the same Festschrift it is difficult to see any 

 resemblance between the two either in the number and 

 forms of the lobes or of the nerve roots, and little reliance 

 can be placed on any of this evidence until this species is 

 re-examined. 



