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



endings it contains would seem to indicate, in addition, some 

 special function. 



With one exception the branches of the R. maxillaris need 

 not be described further. This one is given off at about 310, 

 passes cephalad and mesad and here subdivides. One subdivi- 

 sion is continuous with a branch of the R. palatinus VII while 

 the other, together, apparently, with a portion of the R. pala- 

 tinus, proceeds cephalad along the side of the oral cavity sup- 

 plying its epithelium with fibres and finally breaking up at its 

 extreme anterior end (PI. VII, Fig. 2). 



Besides these branches of the Trigeminus there are a number 

 of others which have been but little noticed and yet, though 

 small, seem to be of some morphological importance. There 

 are usually three of these and all are given off in about the 

 same transverse plane, and about .3 mm. caudad of the division 

 of the V into its maxillary and mandibular branches. Two of 

 these arise from the inner side of the V, — from the inner side 

 of the anterior extremity of the Gasserian ganglion, — and one 

 can be traced caudad along its inner side almost to the point of 

 separation of the R. ophthalmicus. The third and largest 

 branch arises apparently from the outer side of the V but its 

 fibres can be seen passing mesad across the dorsal side of the 

 V, so that they ultimately originate from about the same point 

 as do the other two. These accessory branches seem to derive 

 their fibres, in part at least, from the few large ganglion cells 

 in the dorsal and mesal side of the trunk of the V, consti- 

 tuting the apex of the Gasserian ganglion. 



These branches, like the other branches of the V, consist 

 principally of small fibres with a few large ones among them. 

 They fuse temporarily with certain branches of the VII, as will 

 be described below. 



It will not be necessary to describe the branches of the V 

 further as no departures of importance from, or additions to, 

 the usual descriptions have been noted. 



The cutaneous terminations of the fibres of the various 

 branches of the Trigeminus (PL VII, Figs, i and 4,) present no 

 especial differences among themselves. Their modes of branch- 

 ing and courses differ, however, in diflFerent tadpoles, and these 



