No. I.] THE CRANIAL NERVES OF AMPHIBIA. 123 



It may be remarked here that it would be extremely inter- 

 esting to study, from this point of view, the innervation of the 

 stomodaeum and pharynx of forms in which their relative 

 extents vary. Indeed, this will probably be necessary as sup- 

 plying one of the guides in reaching accurate knowledge of 

 the homologies of the nerves of this region in different forms, 

 and especially with the higher forms, where the relations are 

 so complicated. 



The mode of branching of the R. palatinus VII in the adult 

 frog, and also its terminations in epithelium, glands, and blood 

 vessels, have already been described by Stirling and Macdonald 

 (60). These investigators made use of the gold method, and 

 it will be well to add some results obtained with the Golgi 

 method, especially as the endings in this region have not been 

 so fully described in the tadpole by Retzius (51), von Len- 

 hossek (38), and others, as in other forms. 



The structures innervated are blood vessels, general epithe- 

 lium, glands, and end buds (taste bulbs). In the olfactory 

 region we have the mucous glands, which fall, in part at least, 

 in the trigeminal territory. My impregnations, however, have 

 not demonstrated much respecting the innervation of these 

 glands, merely showing some scattered fibres coursing around 

 their periphery. 



Vaso-motor fibres, following the blood vessels and often 

 ending in their walls with little knob-like expansions, are 

 met with here and there. Whether these vaso-motor fibres 

 come merely from sympathetic fibres mixed with those of the 

 R. palatinus proper, or also from the latter, it is hardly possible 

 to determine. Stirling and Macdonald have described nerve 

 cells in this region with spiral fibres. I have also occasionally 

 met with nerve cells, though whether of this type or not I 

 could hardly determine. 



Before treating further of the finer terminations of this nerve, 

 and in order to make clearer some points mentioned below 

 respecting the terminations of other nerves, it may be well to 

 indicate briefly the structures found in this region. These 

 have been described so clearly and admirably by F. E. Schulze 

 (53) that I cannot do better than give a brief resume of a 



