202 JOURNAL OF COMPARATIVE NEUROLOGY. 
of the branches is indicated on Fig. 1, all twigs not supplying 
canal organs being distributed to small pit organs. 
17. R. ophthalmicus superficials trigemint. 
The three components which in most teleosts are bound up 
together to form the supra-orbital trunk (compare the account 
in the Menidia paper, ’g99) in the siluroid fishes are arranged in 
two distinct groups. One of these is the r. ophthalmicus super- 
ficialis VII, which has been described just above; the other is 
the so-called r. ophthalmicus superficialis V, containing in 
Ameiurus general cutaneous and communis fibers in about 
equal proportions. The course and morphological significance 
of this nerve have been discussed in detail by Mr. WorkMAN 
(00) and these details need not be repeated here. I will 
merely copy his summary of the course of this nerve. 
“To recapitulate, the r. ophthalmicus superficialis trigemini 
arises from the ganglionic complex slightly cephalad and ventrad 
of the r. ophthalmicus superficialis facialis, emerges through the 
cranium by a separate foramen, and pursues an entirely sepa- 
rate course peripherally, lying ventrally of the latter nerve and 
widely separated from it by the fleshy origin of the m. dilator 
operculi. In front of the orbit it passes through a foramen in 
the frontal bone to run forward close to but distinct from the 
facial ophthalmic nerve. It distributes to the skin and its con- 
tained terminal buds in front of the eye, about the nasal aper- 
tures and in front of the latter and to the nasal barblet—about 
the same distribution, in short, as the fibers of the r. ophthalmi- 
cus 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 terminal 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 com- 
munis component observed to enter the nerve proximally being 
correlated with the enormous number of buds innervated.”’ 
From this account it follows that this nerve of siluroids 
