MAMMALIA. 131 



the septum, and may be traced near to the extremity of the nose, the other passes on 

 the Schneiderian membrane, at the superior part of the outer surface of the nose, and 

 at about one-third of the distance from the upper part of the nose sends a branch 

 outwardly, underneath the nasal bone, to the strong membrane covering the Schnei- 

 derian membrane, it then passes to the extremity of the nose, and terminates on the 

 Schneiderian membrane, and the strong membrane covering this. The continuation 

 of the superior nasal forwards, after it has sent the large branch into the nose, appears 

 to occupy the place both of the superior nasal and supra-orbital, by its supplying so 

 considerable a part of the upper eye-lid and eye-brow with branches. In the dog it 

 gives off the superior nasal, this sends one branch into the nose, and then passes to the 

 inner angle of the eye, to terminate on the upper eye-lid and eye-brow ; it gives off 

 another that may be compared with the supra-orbital in man, which sends a branch 

 to join one from the temporal, for the lachrymal gland, and then supplies the middle 

 of the upper eye-lid and eye-brow. There are variations in different species, so that 

 the nasal may send off a considerable branch to the middle of the eye-lid and eye- 

 brow, just before it leaves the orbit, or this branch may be sent off at the beginning 

 of the first trunk, and then resemble more the supra-orbital in man. In the pig it 

 gives off the superior nasal, which sends one branch into the nose, and then passes to 

 the inner angle of the eye, to terminate on the eye-lid and eye-brow : it gives off 

 another, that may be compared with the supra-orbital in man, which communicates 

 with the lachrymal nerve, and then supplies the middle of the upper eye-lid and 

 eye-brow ; it gives off the lachrymal, which sends filaments, with others from the 

 temporal to the lachrymal gland, and then supplies the outer part of the upper eye-lid. 

 In the sheep, minute filaments from the supra-orbital nerve enter the sclerotic coat 

 of the eye ; a small branch gives filaments to the levator muscle of the eye, and then 

 joins the fourth nerve, before its termination in the superior oblique muscle ; filaments 

 also pass to the other muscles of the eye, the fat and conjunctive membrane of the 

 eye-lids. In the porpoise the first trunk is very small, and after giving filaments to 

 the lenticular ganglion terminates on the skin of the upper eye-lid. 



The second trunk of the fifth is usually very thick ; it gives off the malar nerve, 



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