V. Kupp'FEK, Cranial Nerves of Vertebrates. 319 



region I have described, from the stage of development 

 reached in the days immediately preceding the exit of the 

 embryo:(') (i) A large isolated lateral ganglion arising from 

 the epidermis, and located over the second and third gill 

 pouches; (2) a medial ganglion proceeding from the root- 

 border (Wurzel Leiste) and uniting with the latter; thus 

 there are, according to my present terminology, the compo- 

 nents of a principal ganglion of the vagus; (3) epibranchial 

 ganglia over the second and the following gill pouches. A 

 lateral ganglion assigned to the glosso-pharyngeus is devel- 

 oped between the auditory vesicle and the vagus, and not 

 isolated from the epidermis. I supposed, therefore, that the 

 glosso-pharyngeal ganglion described -by Scott and Shipley 

 is an epibranchial ganglion. ('■) At the same time I pointed 

 out that there is no sharp division between the facial group 

 and that of the vagus at this stage. The epibranchial gan- 

 glion lying over the second gill pouch received a verv notice- 

 able addition from the root-border, consisting of cells and 

 fibrillas, but at the same time a nerve originating from the 

 facial root sinks into this ganglion, which I called the ramus 

 recurrens of the facial. 



In AmmoccEtes of 4 mm. the relations are much clearer, 

 the individual parts are more separated, and at the same time 

 there has taken place a displacenient laterad which renders 

 easier the comparison with the relations in older Ammoccetes. 

 The epibranchial ganglia experience a transference caudad, so 

 that they are no longer located over the gill pouches, but are 

 over the corresponding gill septa (visceral arches), i.e., the 

 ganglion formed over the second gill pouch now lies directly 

 over the septum between the second and third gill pouches. 

 The auditory vesicle in larva? of 4 mm. is situated over the 

 second gill pouch, projecting somewhat beyond it both 

 caudad and cephalad. As the principal ganglion of the 

 facial lies close to the wall in the fore half of the auditory 



1 Ibidem, p. 544. 



2 Ibidem, p. 552. 



