Kingsbury, Oblongata in Fishes. 2g 



perficialis VII, buccal and otic and hyomandibular. We should 

 expect the root from the " lobus trigemini " of sharks to be 

 coarse fibered if it innervates the lateral line organs. If Ewart 

 is correct, the Ampullae of Lorenzini would be more closely 

 related to the lateral line organs and not representatives in 

 Elasmobranchs of end-buds of higher forms. ^ In Amphibia, 

 though no differentiated lobus trigemini exists, it is represented 

 morphologically by the cephalic portion of the fasciculus com- 

 munis in connection with the preauditory root from this tract, 

 Vllaa Strong. Of the three alternatives offered in the inter- 

 pretation of the lobus trigemini and the innervation of the end- 

 buds, when it is recognized that the lobus trigemini and lobus 

 vagi are but differentiated parts of the fasciculus communis 

 tract, the first two lose their point and the third, which Strong 

 regarded as most probable, stands, with this modification, that 

 the lobus vagi and lobus trigemini, of teleosts, instead of being 

 distinct structures partially equivalent, are but the differentiated 

 pre- and postauditory parts of the same system. The question 

 of the innervation of the end-buds remains as difficult and as 

 far from a satisfactory solution as before. It is quite possible 

 that, as Strong suggests, two kinds of fibers from different por- 

 tions of the fasciculus communis tract may have distinct distri- 

 butions — one end-bud and the other splanchnic. 



The view apparently entertained by Allis ('95) that the fas- 

 ciculus communis gives rise to fibers distributed exclusively to 

 end-buds is certainly not correct, since very much the larger 

 part of the sensory (ganglionated) fibers of the vago-glosso- 

 pharyngeal spring in Amia (and in other Teleostomes) from that 

 tract. 



That the end-buds on the head of teleosts receive their 

 innervation from both pre- and post-auditory portions of the 

 tract is undoubtedly true from the investigations of Wright, 

 Allis and Strong. In Amiiinis (Wright) and the carp barbel 

 end-buds in the skin of the head are plentiful, and doubtless 

 when other cyprinoids and suckers are examined the end-buds 



'Since they are innervated by the same nerves as are the lateral line organs. 

 See also Cole, '96. 



