Herrick, JVerves of Szluroid Fishes. 1o7 
6. Ramus ottcus. 
This nerve arises from the dorsal part of the ganglionic 
complex just cephalad of the origin of the r. lateralis accessorius 
and carries lateralis, general cutaneous and communis fibers 
(Figs. 1, 2). The lateralis fibers arise separately from the 
others, join them for only a very short distance, and separate 
at once, running back in the bony lateral line canal of the post- 
frontal and squamosal bones internal to the membranous canal 
to supply the first organ of the main canal, which lies in the 
squamosal bone. The general cutaneous and communis fibers 
run through the cranial roof laterally of the main canal and 
supply the adjacent skin and that of the dorsal part of the 
operculum. This whole region is plentifully supplied with 
terminal buds and small pit organs, probably supplied by com- 
munis and lateralis fibers respectively which accompany the 
general cutaneous fibers last mentioned, though their innerva- 
tion was not demonstrated. These general cutaneous fibers 
occur also in Clarias (POLLARD, ’92) and probably correspond 
to some (but not all) of the similar nerves described by STRONG 
(95) for the tadpole of the frog as accessory trigeminal 
branches. (On the homologies of these latter nerves in the 
Amphibia, cf. CoGHILL, ’01). 
Another slender nerve belonging to the lateralis system 
arises immediately caudad of the r. oticus from the dorsal later- 
alis ganglion (Figs. 1, 2, 6, 7, ~. 5 and x. a. /.), which may 
conveniently be described here, though it doubtless belongs 
morphologically with the r. ophthalmicus superficialis VII. 
This nerve runs up along the lateral aspect of the optic lobes 
and soon divides, one portion directed cephalad and one caudad, . 
both running for a considerable distance {ntra-cranially. The 
former portion runs under the cranial roof to the level of the 
fifth organ of the supra-orbital canal and here (Fig. 6, 2. 5) 
pierces the cranium to supply this organ. The portion directed 
caudad (Figs. 1, 2, 2. a. /.) was traced into one of a series of 
three naked neuromasts in a row extending caudad from the 
last pore of the supra-orbital canal (Fig. 1, a/.) and evidently 
