( 1051 ) 
Slightly more caudally than is shown by Fig. 6, the hypoglossus- 
cells (or the auterior-horn cells; a sharper distinetion between them 
cannot be made by my method) take a more ventral position, and 
can only with difficulty be distinguished from the reticular cells 
Which lie in the lateral border of the fase. longit. post. 
Fig. 7 represents a section which passes through the entering 
\ roots. The same nucleus with large cells as in Fig. 6 is met with 
here, though on a more frontal level. The large cells can be seen 
lving partly in the raphe, partly in the formatio-reticularis, spread 
wreath-like in a ventro-lateral direction, while a small group lies 
more or less isolated somewhat more ventrally. (Fig. 7c.) Laterally 
in the peripbery a nacleus can be seen (Fig. 7 /,), which I cannot 
determine with certainty to be the continuation of the lateral nucleus 
(/,) of Fig. 6, since nucleus /, decreases frontally, so that on a level 
between Fig. 6 and Fig. 7 very few cells lie there which cannot 
be distinguished from the remaining scattered cells of the formatio 
reticularis. 
The large reticular cells on the level of the VIII root entrance 
can be taken together in one and the same group with those occur- 
ring more frontally. This group is easily distinguishable from the 
more caudal reticular nucleus of the vagus region. 
pe 
aff: 
b 
ae. 
a 
Ee 
is / 
PS 
4 Erf 
/ 
a ne VT venta 
c 
Fig. 8. Alligator sclerops. 
Fig. 8 represents a section through that part of the oblongata that 
may be regarded as the transition or boundary region between vagus 
and octavus region. On several of the sections only one single large 
reticular cell is to be seen on this level; in Fig. 8, one can be seen 
in the border of the fase. long. post. (6). Ventrally in the raphe (a) 
