188 JOURNAL OF COMPARATIVE NEUROLOGY. 
corresponding to the ‘‘anterior pit line’ of Amia (ALLIs, ’89). 
The other two organs are doubtless innervated from this same 
twig. This nerve clearly represents the nerve for the seventh 
supra-orbital lateral line organ and for the anterior pit line in 
Amia and the nerve for the seventh organ of the supra-orbital 
canal of Batrachus (CLapp, '99). From the brief mention of 
STANNIUS (’49, p. 48) it is evident that Silurus presents a fiber 
complex in connection with the r. oticus similar to that de- 
scribed in this paragraph. 
7. The hyomandibular trunk. 
This trunk receives four components, viz. the motor VII 
root, the ventral lateralis root of the facialis, and small general 
cutaneous and communis strands. The mode of origin of the 
two latter from their ganglia has already been described. The 
lateralis root forms the r. mandibularis externus VII. The 
motor facialis root in part enters ther. hyoideus, where its fibers 
supply the branchiostegal muscles in the typical way, and the 
remainder of this motor root distributes with the branches 
which I included in the account of Menidia under the term r. 
opercularis profundus facialis. These branches supply the fol- 
lowing muscles: adductor arcus palatini, adductor hyomandi- 
bularis, levator operculi, adductor operculi. The arrangement 
of these nerves in Ameiurus conforms to that of teleosts in 
general, save that, as is well known, the twig for the m. adduc- 
tor arcus palatini supplies a separate slip of that muscle which 
serves as the abductor of the maxillary barblet. The general 
cutaneous fibers of the hyomandibular trunk here, as in teleosts 
generally, are to be regarded as secondary accessions to the 
facialis segment from the trigeminus. The communis fibers in 
the hyomandibular trunk apparently do not, as in the tadpole 
of the frog and Menidia, form a r. mandibularis internus VII, 
since this nerve is, as in Gadus, totally wanting. For no fibers 
from the hyomandibular trunk could be traced to the mucous 
lining of the mouth, either to terminate with free endings or to 
supply taste buds. On the other hand, all communis fibers of 
the truncus hyomandibularis seem to terminate in terminal buds 
