1431 
which are lateral and ventro-lateral from them, the nucleus cerebelli 
lateralis, which reaches to the nucleus vestibularis. 
These figures alone would lead us to form the opinion that the 
cells in the cerebellum are nothing but a continuation of the nucleus 
vestibularis, which in this animal would then reach into the tectum 
cerebelli. Before going further into this question I shall say a few 
words about the VIII nuclei. 
In agreement with Gorpon Hormrs *) L distinguish in the oblongata 
3 distinct nuclei in the octavus region, viz. the nucl. magnocellularis 
dorsalis, which contains the greater part of the fibres of Radix pos- 
terior; further a nucleus laminaris, which may be regarded as being 
probably a secondary cochlearis nucleus, and the nucleus ventralis, 
which certainly is to be regarded as vestibularis nucleus. 
If 1 compare the description and drawings of Hormes with what 
L see in WeteerT-Par and van Ginson preparations, | come to the 
conclusion that the ventralis (HoLMks) consists of two portions. 
The large cells form one nucleus, the nucl. Deiters (which again 
can be divided in some parts). 
The smaller celis frontally from the Deiters nucl. clearly form a 
separate group, to which I would give the name of nucleus vesti- 
bularis anterior’). Hotmes has already noted that part of the ventral 
VIII fibres, ie. the vestibularis fibres, bend in a longitudinal direction 
and pass frontally to this frontal portion. 
Whereas the cells of the nucl. Deiters are’ still strongly polygonai 
on a level immediately caudally from that shown in fig. 6, those 
of the nucleus anterior frontally gradually lose their distinct polygonal 
character. Added to this, the cells seen in the frontal sections fre- 
quently vary between two chief types, one approaching the egg- 
shape, the other more spindle-shape in form. 
These two cell-types, in the Alligator, seem to merge into one. 
The farther frontally one goes, the more egg-shaped cells one 
finds, both in the Alligator and in Chelone. The nucleus at the same 
time stretches out more dorsally, medially from the corpus restiforme, 
and gradually changes into cell-groups which can no longer be 
counted as belonging to the oblongata. At this point we have reached 
the nuclei cerebelli. 
In the brachium conjunctivium, which is already recognisable as 
such in Reptiles and is connected with the nucleus ruber, fibres run 
1) Gorpon M. Hormes: On the comparative anatomy of the nervus acusticus. 
Transactions of the Royal Irish Academy. March 1903. 
2) It probably corresponds to the nucl. vestibularis superior of Beccari (Arch, 
It, di Anat. Vol. X p. 664), 
