488 ALUS. [Vol. XI. 



ganglion of the fasciculus communis root, and branches of each 

 are distributed to regions where terminal buds abound: such 

 branches often taking what are apparently circuitous courses 

 to reach regions more naturally supplied by branches of other 

 nerves. Certain branches of the two trigeminal nerves, there- 

 fore, probably innervate terminal buds, and such branches 

 probably arise from the fasciculus communis component of 

 the nerve to which they belong. One of these branches, a 

 branch of the maxillaris inferior, becomes the mandibularis 

 internus trigemini distributed to the inner surface of the man- 

 dible. It is, therefore, probably the homologue of the palatinus 

 inferior facialis of certain fishes (Protopterus), and hence (Pin- 

 kus) the homologue of the chorda tympani of higher vertebrates. 

 As the mandibularis internus facialis is a postspiracular nerve, 

 it cannot be the homologue {Ewart, Strong, Pollard) of the 

 chorda tympani, as that nerve is prespiracular. 



12. The pharyngeal and pretrematic branches of the glosso- 

 pharyngeus are in Amia distributed to regions where terminal 

 buds abound, and branches of the pretrematic nerve were with 

 reasonable certainty traced to certain of those organs. The 

 glossopharyngeus, in Amia, receives no recurrent or communi- 

 cating branch from the palatinus facialis as it does in Protop- 

 terus (Pinkus). The fasciculus communis component of the 

 nerve, if there be such a component, must, therefore, be of 

 intracerebral origin as it is in Rana (Strong) and in birds 

 (Brandis), the funiculus solitarius in Aves being the homologue 

 of the fasciculus communis in Pisces (Strong). 



13. The vagus in Rana receives fibres from the fasciculus 

 communis tract (Strong), and in Aves from the funiculus soli- 

 tarius (Brandis). As terminal buds are found in Amia in the 

 branchial chamber where branches of the vagus are distributed, 

 it may be assumed with reasonable certainty that the vagus 

 in Amia receives fibres from the fasciculus communis tract, 

 and that these fibres innervate the buds innervated by that 

 nerve. 



14. Terminal buds represent a condition or stage through 

 which the canal organs of the lateral lines have passed in their 

 development (Wiedersheim). Terminal buds and the nerves 



