Workman, Nafes of the Cat Fish. 407 



a foramen in the frontal bone to run forward close to but dis- 

 tinct from the facial ophthalmic nerve. It distributes to the 

 skin and its contained terminal buds in front of the eye, about 

 the nasal apertures and in front of the latter and to the nasal 

 barblet — about the same distribution, in short, as the fibers of 

 the r. ophthalmicus superficialis facialis destined for pit organs 

 contained in large numbers in this same area of skin. In no 

 case were the fibers of the facial nerve observed to enter ter- 

 minal buds nor those of the trigeminal nerve to enter pit organs. 

 The trigeminal ophthalmic nerve undoubtedly innervates the 

 skin in general of this area by means of its general cutaneous 

 fibers and the terminal buds by its communis fibers, the large 

 size of the conimunis component observed to enter the nerve 

 proximally being correlated with the enormous number of buds 

 innervated. 



The r. ophthalmicus superficialis V does not run under any 

 of the eye muscles, their nerves or any of the other orbital 

 structures which typically overlie to r. ophthalmicus profundus. 

 It cannot therefore be regarded as the profundus nerve. On 

 the other hand, there are no fibers which can be regarded as 

 the r. ophthalmicus superficialis V save these and their course 

 is the same as that of the latter nerve in other teleosts, save for 

 their separation from the facial ophthalmic nerve by the origin 

 of the m. dilator operculi, which extends very far forward 

 in Ameiurus. 



The infra-orbital trunk comprises the r. buccclis (for the 

 infra-orbital lateral line canal) and the maxillary and mandibular 

 nerves. These three nerves soon separate from each other, but 

 run parallel for a short distance. 



The maxillary and mandibular nerves have the typical tele- 

 ostean composition, receiving the motor trigeminal root (r. man- 

 dibularis) and the major parts of the general cutaneous trigem- 

 inal and the communis facial roots. These two latter roots run 

 direct!}' ccphalad from the ganglionic complex into the infra- 

 orbital trunk, having previously given off several branches dor- 

 sally (the r. lateralis accessorius of communis fibers, dorsal gen- 

 eral cutaneous twigs, and the r. ophthalmicus superficialis V, 



