254 journal of Comparative Neurology and Psychology. 



pass ventrad through foramina in the floor of the nasal chamber, 

 and branch out to the oral epithelium. Some of these twigs reach 

 the vicinity of the gums. Whether they connect with the teeth or 

 with taste buds that occur very near them is not clear. The 

 lateral division of the ventral ophthalmic branch is much more 

 difficult to trace. Nevertheless my preparations have enabled 

 me to determine conclusively that the branch of the palatine which 

 passes laterad around the caudal border of the internal nares is 

 accompanied by profundus fibers. This relation is not clear in 

 all cases, but enough cases are clear to convince me that the 

 apparent exceptions are due to the complexity of the anastomosis 

 and the direction of the plane of section. In at least two of my 

 specimens the lateral branch of the palatine connects, also, with a 

 division of the lateral terminal branch of the profundus. In these 

 particular cases, however, it is impossible to trace any fibers from 

 the ventral terminal branch of the profundus into the lateral pala- 

 tine branch. 



With these exceptions Triton and Amblystoma seem to agree 

 exactly with respect to the relations of thq r. palatinus VII and r. 

 ophthalmicus profundus V. A peculiar relation of the r. buccalis 

 VII to these nerves in Triton will be described in connection with 

 the buccal nerve. 



2. -The Truncus Infraorbitahs. — The only feature of this divi- 

 sion of the trigeminus which demands special notice is the relation 

 of the so-called r. maxillaris V and the r. buccahs VII to one 

 another and to the r. palatinus VII. 



The term jiiaxillaris, as applied to the general cutaneous branch 

 of the trigeminus which passes beneath the eye in the upper jaw 

 of Urodeles, is used here with the qualification that it is not to be 

 considered the homologue of me r. maxillaris superior of Anura. 

 My reasons for this interpretation have been given in my earlier 

 papers ('oi, '02), and some further consideration of it will be 

 offered in the general discussion which follows the descriptive 

 part of this communication. 



These nerves, in their proximal region, are best studied in sec- 

 tions cut parallel to the sagittal plane. In some instances the 

 buccalis is purely lateralis, and the maxillaris is purely general 

 cutaneous as far as their point of flexure cephalad. Here the 

 nerves cross each other in such an intricate manner that it has 

 been impossible for me to assure myself that beyond this point 



