524 DAVIDSON BLACK 
In Solea, the fibers of the first motor rootlet which arises from 
the occipito-spinal nucleus, pass obliquely caudad and ventrad 
and become collected upon the periphery to form a small bundle 
which courses some sections caudad in this location before leav- 
ing the brain. A similar arrangement obtains in Ameiurus and 
in other teleosts (cf. Van der Sprenkel, 1. c., fig. 4). 
The caudal viscero-motor column (Col. visc. mot. caud.). The 
caudal viscero-motor column in Solea, unlike that of selachians 
\ 4 
Nu.occ.sp.m. 
28 
Fig. 28 Ameiurus nebulosus. Transverse section of brain stem at the exit 
level of the second occipito-spinal rootlet. 
Fig. 29 Transverse section of brain stem somewhat rostrad of the preceding 
at the exit level of motor vagus rootlets. Abbreviations: Nu.f.l., lateral funicu- 
lar nucleus; Nw.occ.sp.m., motor occipito-spinal nucleus; F.occ.sp.m., second 
motor occipito-spinal rootlet; R.X.8., sensory root bundle of the vagus. Other 
abbreviations as in figures 26 and 27. 
and ganoids, is divided into two distinet portions:—a rostral 
part formed by the rostral motor VII nucleus and a long caudal 
cell column comprising the motor nuclei of the vagus and 
glossopharyngeus together with the caudal motor VII nucleus. 
A similar subdivision of the caudal viscero-motor column occurs 
in Ameiurus, but with this characteristic difference, that the 
rostral subdivision contains all the cells of origin of the motor 
facial root, while the caudal subdivision comprises only the 
motor vagus and glossopharyngeus nuclei. 
