( 1049 ) 
of reticular ceils is found (Fig. 3). There 6—8 large cells per section 
are to be found in each bulbus-half, arranged round the ventro- 
lateral border of the fase. long. post; the most dorsal lie almost in 
the middle of the dorso-ventral diameter of the bulb (Fig. 3: 5), 
and the others medio-ventrally from there, more towards the lower 
border of the fasc. longit. post. (Fig. 3:¢.) A few smaller cells have 
a more ventro-lateral position. — In the raphe only a few smaller 
cells occur. 
Frontally from the VIll-entrance the number of large reticular 
cells again decreases, and 3—5 per section are found. (Fig. 4 : h. and 
Fig. 5 5 and c.). 
The position is almost the same as on the VIII level. The small, 
ventro-laterally situated cells are also seen again frontally from the 
VIII entrance, the most clearly jist behind the V root entrance. Fig. 
4 shows a section through the motor V nucleus. Fig. 5 a section 
frontal from that. With slieht variations in the number of the cells 
the series of reticular cells continues as far as under the frontal 
boundary of the Braechia cerebelli and, where the Bracchia dis- 
appear from the sections, it is seen only sporadically. *) 
In the raphe merely a few smaller cells occur frontally from the 
VIII’s entrance. 
Neither on the VIII level nor frontally from it is there any trace 
‚of a raphe nucleus proper. 
Rana. 
In the amphibia, where the arrangement of all the cells remains 
periependymal, the making of a distinction between reticular cells 
and other cellular elements is too difficult to allow of details being 
learned about their topography. 
Alligator Sclerops. 
The large reticular cells in the oblongata of the alligator can be 
divided into 2 principal groups. The most caudal group lies on the 
level of the entrance of the X roots and contains a reticular nucleus, 
capable of being fairly sharply defined. This nucleus commences, 
caudally in the oblongata, as a little cluster of small reticular cells 
in the raphe and under the fase. long. post., while a small group 
of cells is also to be seen on caudal sections ventro-laterally in the 
1) More frontally in the midbrain again a larger amount of reticular cells occur. 
This is, however, beyond my scope. 
