OF PIPA AMERICANA. 131 



and also where the frontalis pierces the premaxillary bone 

 and exchanges fibres with the palatine nerve. This re- 

 gion of the snout is entirely supplied by the maxillaris 

 and nasalis in this form. I failed to discover any branch 

 to the muscles of the eye. 



The supramaxillaris superior 1 is the largest ramus of the 

 trigeminal. Almost immediately after leaving the Gasser- 

 ian ganglion, from the anterior end of which it takes its 

 origin, it becomes divided into two branches : 1. The 

 maxillaris proper. 2. The nasalis of Von Plessin and 

 Rabinowicz. 



These two branches have a similar course forward, turn- 

 ing slightly inward and downward. The maxillaris takes 

 a more ventral course than the nasalis, although they do 

 not become widely separated until after the anastomosis 

 between the maxillaris and the palatine has occurred. 

 The maxillaris and the palatine run very nearly parallel 

 throughout their courses ( and at no very great distance 

 from one another ; hence the commissure between them 

 is short compared with its length in most Batrachia. It 

 also presents another and more marked difference from 

 the conditions obtaining in most Batrachia, in that its course 

 is vertical rather than horizontal. After this anastomo' 

 sis has occurred, the maxillaris continues forward in two 

 branches which distribute themselves in the region of the 



O 



nose and the side of the jaw. No terminal filaments con- 

 necting this nerve with the frontalis or the palatine can 

 be traced. 



The nasalis 2 (n.) lies slightly above the maxillaris af- 

 ter their separation, and so preserves an almost horizontal 

 course forward to the tip of the nose, in which region 



1 Supramaxillaris superior, Von Plessin and Rabinowicz = Supramaxillaris, 

 Ecker=Upper maxillary branch, Wyman=\Iaxilluris superior, Fischer. 



2 Nasalis, Von Plessin and Rabiuowicz. 



