Herrick, Nerves of Siluroid Fishes. 185 
ous with the latter running up just cephalad of the emerging 
trigeminus root and enlarging above the latter to form the gang- 
lion of the r. lateralis accessorius (Figs. 2 and 7). A few com- 
munis fibers separate from these cells to go out with the r. 
oticus. The main cellular mass of this communis or geniculate 
ganglion lies ventral and internal to the other members of the 
complex, as described in connection with the Gasserian gang- 
lion. A small bundle of fibers leaves the ventral edge of the 
ganglion for the truncus hyomandibularis and a short distance 
cephalad the r. palatinus posterior separates, leaving the cra- 
nium by the same foramen as the infra-orbital trunk. The pala- 
tine nerve separates from this trunk considerably farther ceph- 
alad outside of the foramen. All of the other communis fibers 
enter either the r. ophthalmicus superficialis trigemini or the 
‘nfero-medial strand” for the maxillary and mandibular 
branches of the trigeminus. 
4. The laterals roots. 
The dorsal and ventral lateralis roots arise together, but, 
as mentioned above, immediately separate. The dorsal one 
with its ganglion retains its position as the most dorsal member 
of the complex and divides to form r. ophthalmicus superficialis 
facialis and the r. buccalis in the typical way. Similarly the 
ventral root and its ganglion run down the lateral face of the 
complex to enter the hyomandibular trunk. The first and last 
rami mentioned leave the cranium by their own foramena, the 
r. buccalis with the infra-orbital trunk. The further descrip- 
tion and critique of the relations of the terminal nuclei of 
these sensory roots will be deferred for fuller treatment at 
a later time. 
5. Comparative review of roots. 
In comparing the trigemino-facial roots of Ameiurus with 
those of Silurus, the description of Srannrus (’49 p. 25) shows 
that the relations are substantially identical. His first root 
contains the general cutaneous and motor V, the second and third 
are the dorsal and ventral lateralis roots, the fourth is the com- 
munis and the fifth the motor VII. The descriptions given by 
