Herrick, erves of Siluroid Fishes. 203 
should not be called the r. ophthalmicus profundus, as has been 
done by WriGut and some others; but that it corresponds in 
all essential respects with the nerve commonly named tthe r. 
ophthalmicus superficialis V by teleostean anatomists. This 
term is also inappropriate, as I have before pointed out; for in 
Ameiurus fully half of its fibers are derived from the geniculate 
ganglion and therefore belong to the facialis and not to the 
trigeminus. In Amia too Attis finds a large communis 
element in this nerve, with similar distribution, viz. for terminal 
buds of the skin of the top of the head. Although the general 
cutaneous or trigeminal element is no doubt largely in excess 
in teleosts in general, as I have found it to be in Menidia and 
Gadus, yet the communis element seems to be uniformly pres- 
ent, even in cases like those last mentioned where there is no 
considerable number of terminal buds on the top of the head. 
18. Ramus lateralis accessorius. 
This nerve arises from the most dorsal and proximal por- 
tion of the geniculate ganglion. A compact mass of cells runs 
up along the inner side of the trigeminus root and ganglion and 
of the dorsal lateralis root which swells out above these roots 
at the level of the superficial origin of the trigeminus root into 
a larger ganglionic mass (Figs. 2, 7). Fibers of the r. lateralis 
accessorius arise from all of these cells and the nerve runs 
caudad within the cranium for a short distance as a large round 
bundle pressed as closely as possible to the dorso-lateral border 
of the oblongata. 
From the ganglion at the root of the r. lateralis accessorius 
a slender twig rises up to the dorso-lateral angle of the cranial 
cavity and there runs cephalad in company with a big blood 
vessel, finally to break up over the cerebellum and perforate the 
cranial roof by many apertures, innervating terminal buds of the 
overlying skin. This nerve I have termed the meningeal ramus 
of the r. lateralis accessorius (m, Figs. 2, 5, 6). STANNIUS 
mentions a similar twig in Silurus (49, p. 48). 
The accessory lateral line nerve runs back under the cranial 
roof nearly to the caudal limit of the medulla oblongata before 
