534 'Journal of Comparative Neurology and Psychology. 



nasalis internus {pp. (/)), arises as a group of nerves, or as a single 

 nerve, that soon divides into branches. The larger of these 

 branches {op. (la)), that goes up through the edge of the cranium 

 in a passage-way between the frontal and the prefrontal bones and 

 then runs along in a canal in the edge of the frontal as far as the 

 nasal capsule, was called by Kingsley "ethmoideus caudalis." 

 Anteriorly this can be traced along the upper surface of the frontal 

 bone to a point halfway between the eye and the tip of the snout. 

 As it passes along its canal and on the surface of the frontal it 

 gives off numerous twigs to the overlying skin. Arising from the 

 posterior part of the nasalis internus, or directly from the trunk 

 of the oph. prof., are one or two branches {op. {ib)) that pass to the 

 skin of the dorsum dorsal and a little posterior to the eye. The 

 main portion of the nasalis internus passes anteriorly and enters 

 the dorsal portion of the nasal capsule near its mesal border. A 

 little before its entrance to the nasal capsule it gives off a branch 

 (not figured) that passes forward in the capsule and emerging 

 dorsally from the skull is distributed to the skin near the tip of the 

 snout. After entering the nasal capsule the nasalis internus anas- 

 tomoses with the r. ophthalmicus superficialis VII, then passing 

 nearly to the ventral side of the nasal capsule divides, one branch 

 ascending and uniting with the r. ophthalmicus superficialis in a 

 second anastomosis, and the other passing out of the anterior end 

 of the capsule to be distributed, like the dorsal division anasto- 

 mosing with the oph. spf., to the skin of the tip of the snout. It 

 will thus be seen that the distribution of the nasalis internus and 

 its branches is to the skin of the dorsal side of the head from the 

 extreme anterior end to a point some distance posterior to the eye. 

 In its distribution it seems to answer approximately to the ophthal- 

 micus superficialis V of fishes. It probably gives off fibers to 

 structures in the nasal capsule, but I have detected none such. 

 It evidently does not supply the nasal epithelium. 



A second branch of the ophthalmicus profundus {op. (2)) is one 

 that arises usually in part from the nasalis internus and in part 

 from the main trunk. It was designated by Wilder as r. glandu- 

 laris II, on the supposition that it innervates the lateral nasal gland. 

 It and its branches, of which there are commonly two divisions, 

 anastomose with each other and with the nasalis internus, enter 

 the lateral dorsal portion of the nasal capsule, run anteriorly and 

 emerging from the capsule are distributed to the skin of the side 



