35 2 Journal of Comparative Neurology. 



face of the m. levator arcus palatini to anastomose with 

 the r. oticus and supply the adjacent skin, as already- 

 described, and then it breaks up into a number of similar 

 twigs for the adjacent skin above the eye. Of these twigs, 

 however, one joins the r. ciliaris longus {cil. I.) for the 

 dorsal side of the eye -ball and another runs out into the 

 cornea {co. /). All of these twigs are colored on the plots 

 as if they were general cutaneous, though there is doubt- 

 less a communis element and some are probably directly 

 derived from the sympathetic ganglion at the base of the 

 Gasserian ganglion. 



The trunk runs forward close under the lateral wing of 

 the frontal bone and under the supra-orbital canal, the 

 coarse fibres mostly dorsal and the fine fibres ventral, 

 though in each case there is some admixture of fibres of 

 the other type. 



At about the level of the last (sixth) canal organ of the 

 supra-orbital canal (430) three branches are given off — 

 one of coarse fibres {so. j) for that organ, passing through 

 a foramen in the frontal bone to reach the canal; the 

 second one [so. 4), passing mesally through a foramen in 

 the cranial wall to the meninges of the brain at the level 

 of the cephalic end of the optic lobes, where it turns 

 dorsad; and the third (so. 5) of fine fibres, which goes 

 cephalad parallel to and slightly dorsally of the main 

 trunk. 



The branch so. 4 springs from the mixed ventral por- 

 tion of the trunk and, like that portion, is composed of fine 

 fibres with a few coarse ones intermingled, probably main- 

 ly, if not wholly, general cutaneous. It passes dorsad in 

 the meninges and divides into numerous very fine branches 

 which anastomose more or less with each other, but appar- 

 ently not with any of the other meningeal rami. Two of 



