52 JouRNAL OF COMPARATIVE NEUROLOGY. 
cephalad along the lateral aspect of the internal nares (Fig. 3D, 
x) and is distributed to the antero-lateral areas of the roof of 
the mouth. The remainder of the maxillaris trunk continues 
its course cephalad wholly lateral of the olfactory epithelium 
and is distributed to the skin between the eye and the external 
nares (Fig. 3D, mx). Ican find no fibers of the maxillaris go- 
ing to the eyelids. The region innervated by the nerve corres- 
ponds with a part of the region innervated in Amblystoma by 
the lateral terminal branch of the ophthalmicus profundus (Fig. 
4D, o/). Moreover, the oral region innervated by the maxillaris 
through anastomosis with the lateral division of the palatinus 
VII corresponds with the oral region innervated in Amblystoma 
by a part of the ventral terminal branch of the ophthalmicus 
through anastomosis with the lateral division of the palatine. 
In perfect accord with the facts just cited we find that in 
the larva of Rana the ophthalmicus profundus V, in its origin 
like that of Amblystoma, after giving off several sensory and 
motor twigs, breaks up into two terminal branches, the lateralis 
narium to the skin immediately caudal of the external nares, 
and the medialis narium which passes dorsal of the olfactory 
epithelium and sends a branch, the ramus communicans cum N. 
palatino, ventrad to anastomose with the mesal division of the 
palatinus VII which approaches it from along the mesal aspect 
of the internal nares (Figs. 2, 3, mp). By this anastomosis the 
oral region is innervated which corresponds to the region inner- 
vated in Amblystoma by a part of the ventral terminal branch 
of the ophthalmicus profundus through anastomosis with the 
mesal division of the palatinus VII. 
Reviewing from another standpoint the conditions just de- 
scribed, we see that the ramus palatinus VII in both Rana and 
Amblystoma forms into two terminal branches, one of which 
passes on either side of the internal nares (mp, 4). In Ambly- 
stoma both of these branches anastomose with the ophthalmicus 
profundus while in Rana the mesal division anastomoses with 
the ophthalmic and the lateral division with the maxillaris V. 
Within the oral cavity, therefore, the function of the maxillaris 
te Mae 
