240 DAVIDSON BLACK 
X fibers. The nucleus in question is indicated on the reconstruc- 
tion chart, but in view of the scattered arrangement of its ele- 
ments it was not possible to mark definitely its rostral and caudal 
limits (fig. 16 D, p. 260). 
In Ciconia the arrangement of the nuclei which go to make up 
the posterior visceral motor column is apparently more compli- 
cated than that observed in Cacatua. ‘This is due to the presence 
R.desc.V. 
Fig.3 Cacatua roseicapilla. Transverse section through the medulla a short 
distance rostrad of the calamus. 
Fig. 4 Cacatua roseicapilla. Transverse section through the medulla near 
the rostral end of the caudal visceral motor column. Figures 3 and 4 at same 
magnification as figure 1. 
F.s., fasciculus solitarius; Nu. d.m. X., dorsal motor vagus nucleus; Nu. int. 
XJI., nucleus intermedius hypoglossi; Nu. mag. Vill.c., nucleus magnocellularis 
of the cochlear nerve (Brandis, 14; Holmes, 29); Nw. 1X m., motor glossopharyn- 
geus nucleus; O.7., inferior olive; R. desc. V., radix descendens trigemini; FR. 
VIII. c., cochlear root fibers; R. [X., glossopharyngeal root fibers; R. XJJ., 
hypoglossal rootlets; Vend., fourth ventricle. 
