252 DAVIDSON BLACK 
obtaining in Cacatua and has already been described by Kap- 
pers in his earlier communications (Kappers, 34, figs. 73 and 76). 
The sagittal topography of this nuclear complex in Ciconia js 
Fig. 10 Cacatua roseicapilla. Transverse section through the brain stem at 
the level of the junction of the rostral and middle thirds of the oculomotor nucleus. 
Same magnification as figure 1. Aq. c., aquaeductus cerebri; C. post., posterior 
commissure; Lob. op., optic lobe; Nw. d.l.,-dorso-lateral oculomotor cell group; 
Nu. m.d., dorsal part of the medial, oculomotor cell group; Nu. m.v., ventral part 
of the medial oculomotor cell group; R.JII., obliquely cut radicular fibers of the 
oculomotor nerve; Vent. op., optocoele. 
illustrated in the reconstruction chart, figure 12 E, page 254 
(see also fig. 16 C, p. 260). 
For accurate comparison of the details of the oculomotor and 
trochlear nuclear complex, reconstruction charts of these nuclei 
in Cacatua and Ciconia have been prepared on the same scale 
as Kappers’ earlier charts of these structures in Alligator, 
