No. I.] THE CRANIAL NERVES OF AMPHIBIA. I2I 



of some trigeminal fibres and also of fibres from the sym- 

 pathetic), while the R. hyomandibularis comprises the ventral 

 half of the dorsal VII, the motor root and a part of the fascic- 

 ulus communis component (5^ VII b + VII ab -\- part of VII aa). 

 The possibility of its having also received some fibres, not 

 many, from the Trigeminus cannot be excluded, however, and 

 it also receives fibres from the sympathetic. 



The course of the R. palatinus VII along the roof of the 

 pharynx is sufficiently indicated in the chart. There are some 

 features in its branching, however, which deserve special 

 attention. 



At 400± it gives off a branch which proceeds directly mesad 

 and innervates a curious fold which extends transversely across 

 the roof of the pharynx. This fold, which is described also by 

 F. E. Schulze (53), is directed cephalad and is partially con- 

 tinuous laterally with the surrounding pharyngeal epithelium so 

 as to form a shallow pocket opening anteriorly. This is the 

 way it appeared also in another tadpole examined macroscopi- 

 cally. In the two figures of this fold given (PI. VIII, Figs. 8 

 and 10) one is taken from a section through its posterior part 

 so as to pass tangentially through its epithelium. The other is 

 from the next section cephalad. In other sections examined 

 this fold appears to be more free and to be directed posteriorly. 

 On and around the fold are a number of end buds (taste bulbs), 

 as are described below, which are innervated by the branch of 

 the R. palatinus just mentioned. This fold, as the figures seem 

 to demonstrate, is especially richly innervated. Nor is this due 

 merely to an inequality in the impregnation as is shown by the 

 presence of the branch from the main trunk, the largest branch 

 given off by the R. palatinus up to this point. 



The location of this branch corresponds with that of the 

 vomerine teeth in the adult, possibly being slightly caudad of 

 the latter. 



According to Wiedersheim, in the frog the epithelium in the 

 vicinity of these teeth is supplied with taste bulbs (quoted 

 in 17). 



At the same place where the branch just described is given 

 off, another larger branch separates from the R. palatinus, 



