( 1054 ) 
diameter of the bulbus. Laterally from it a qdorso-ventrally stretehed 
nucleus is seen which is probably a ventral motor V* nucleus 
(KAPPERS) *). 
Fig. 11 represents a section through the entering V root. The large 
reticular cells have partly kept their position more in the middle of 
the formatio reticularis, but partly also le more ventro-laterally, 
stretching out to the upper side of the frontal rest of the olive, which 
is seen on this level, as in fig. 10, as a small mass of grey matter 
(indicated in the figure by dots) with one single little cell. Medially 
from the frontal rest of the olive, a small group of little polygonal 
cells occur regarding which I do not venture to say whether they 
belong to the reticular cells or to the grey substance of the lateral 
lemniseus (fig. 117). 
In the raphe there is a nucleus of small cells, which seems to 
have no connection with the other cells of the formatio reticularis. 
(fig. 11, nr. parvoe. sup. r.); I should like to give this nueleus the 
name of nucleus parvo-cellularis superior raphes in contrast to the 
cluster of large raphe-cells, which form part of the reticular nucleus 
of the vagus region. In Fig. 11, under the angle of the ventriculus 
quartus a group of cells can be seen which in position agree with 
the nucleus loei coerulei*) beginning more frontally in mammals. 
EMEA 
— —— 
Jie deer té poo N 
/ rs Zea fo iN 
JL ; 
Hel = i 
ewes _— 
Se 
\ ] Sie a Se BOY ge 
. > SN 
i oe ie 
| a 5 7 aes ee neers rth 
| NN 
| 
{ 
4 / 
/ 
——__—__+—— 714 A 
c.h.d. - 
/ id me - . / 
« = . 2 
a 
Wig. 12. Alligator sclerops. 
1) Especially from a comparison to chelone midas this is probable; in chelone 
a similar nucleus occurs at this place, which frontally coincides with the motor 
V-nucleus. See Verhandl. der Kon. Akad. van Wet, 2de Sectie, Part XVI N°. 4, 
pages 39 and 40. Map.l. 
*) As in the lower mammals this nucleus is not pigmented here, 
