Herrick, Werves of Siluroid Fishes. 241 
the ophthalmicus superficialis trigemini plus a large communis 
component. This nerve fulfils none of the requirements of an 
ophthalmicus profundus, and deviates from ‘the conditions 
typical for the ophthalmicus superficialis trigemini only in that 
it runs under the origin of the m. dilator operculi. Ameiurus 
therefore, conforms to the teleostean, rather than to the gan- 
oidean, type in this respect also. 
13. The ramus lateralis accessorius clearly arises wholly 
or nearly so from the geniculate ganglion of the facialis and 
throughout its course in the trunk it carries communis fibers 
from this source only, save for the temporary fusion with it of 
dorsal rami of the successive spinal nerves. This nerve can- 
not, therefore, properly be called a ‘‘collector’ of the dorsal 
spinal rami, for its connection with these nerves is accidental 
rather than primary. There are no terminal buds in the trunk 
which are not reached by fibers from this nerve. Moreover, 
since all parts supplied by this nerve have an independent 
general cutaneous nerve supply from the spinal nerves, it Ccan- 
not be regarded as a ‘‘somatic sensory” nerve, or nerve of 
general cutaneous sensibility. The vagal root of ther. lateralis 
accessorius is lacking in Ameiurus. 
14. The glossopharyngeus has the typical teleostean 
composition as it leaves the brain, viz) communis and _ visceral 
motor. Before leaving the cranium it receives a lateralis com- 
ponent from the vagus whose intra-cranial relations are variable. 
This nerve forms ar. supra-temporalis glossopharyngei which 
supplies the second sense organ of the lateral line canal within 
the squamosal bone and the middle pit line. There is no pre- 
trematic ramus nor JACOBSON’s anastomosis. 
15. The vagus has the typical composition. The motor 
root supplies, among others, the pharyngo-clavicularis muscles 
and the trapezius muscle. The vagus has the usual general 
cutaneous component, with its jugular ganglion and r. cutan- 
eus dorsalis, The r. lateralis vagi supplies the lateral canal of 
the trunk and both large and small pit organs. It does not 
participate in the innervation of the skin in general or of termi- 
