628 ALLIS. MViOL. XT. 
rent dorsal branch of the facialis; but that recurrent branch is 
joined, in both fishes, by an important branch from the first 
branch of the lateralis vagi, and as this branch of the lateralis 
vagi supplies organ No. 8 of the main lateral canal, in both 
fishes, it is in all probability this branch, and not the recurrent 
facialis, that supplies the organs of the canal in question. 
Organ No. 8 les in the squamosal near its hind edge, 
and as there is, according to Pollard, no extrascapular and 
no supratemporal crosscommissure in siluroids, the organ No. 
8 of Clarias and Auchenapsis probably corresponds to organs 
18 and 19 of the main canal in Amia. The commissural or 
recurrent branch that connects the nerve supplying it with the 
recurrent dorsal branch of the facialis would, therefore, corre- 
spond to the supratemporal extension of the nerve supplying 
organs 18 and I9 in Amia. The canal along the base of the 
dorsal fin in Clarias and Auchenapsis would then be the supra- 
temporal crosscommissure of Amia, somewhat changed in posi- 
tion and direction, a change that could easily arise since the 
bone traversed by the canal in the one form is wanting in the 
other. 
The great recurrent branch of the facialis described by Pol- 
lard seems to be the ramus lateralis trigemini of other authors. 
In Silurus glanis this nerve is distributed to the dorsal fin, as 
in Clarias and Auchenapsis. In Trichomycterus and Chaetos- 
tomus a large branch is sent from it to the pectoral fin (No. 
94, pp. 536 and 539), and in Gadus morrhua I find this branch 
distributed to the breast fin also. In elasmobranchs and 
Amphibia the nerve is wanting, so far as I can find. Its dis- 
tribution indicates that it is destined largely or entirely to the 
supply of terminal buds, for these buds are not found on the 
body in elasmobranchs and Amphibia, and are found in great 
quantity, but with a greatly varied distribution, on the body, 
and more especially on the fins, in teleosts. The nerve in 
Gadus lies immediately beneath the skin, but crosses the later- 
alis vagi internal to that nerve. It arises as two nerves or 
bundles from the deeper portions of the trigemino-facial gan- 
glion, the two bundles embracing the root of the buccal and 
ophthalmic branches of the facialis exactly as the first pair of 

