102 JouRNAL OF CoMPARATIVE NEUROLOGY. 
The internal structure presents a large nucleus with deeply 
staining chromatin in the form of a reticulum ; and cytoplasm 
somewhat less in quantity than in the cerebellar neurone, and 
holding less tigroid substance. 
From the above description of the morphology of the neu- 
rone of PURKINJE from the tuberculum acusticum, it will be 
evident that it is strikingly like its earlier-known representative 
in the cerebellum. Compare, also, Fig. 7 with Fig. 13. The 
neurone from the tuberculum acusticum (Fig. 7) is merely 
slightly smaller in size, with a dendritic top which branches 
somewhat less. The presence of conspicuous gemmules is char- 
acteristic of both. We shall take occasion to point out further 
on that the cerebellar neurone is to be regarded as the more 
fully developed derivative of this element from the oblongata. 
c. Termination of Acustico-Lateral Fibres.—The fibres of 
the acustico-lateral system enter the tuberculum acusticum 
through the medium of the thin neck joining the acusticum with 
the general cutaneous nucleus below. This fact is expressed in 
Fig. 2, a. 1. f. It apnears, so far as they are traceable, that 
these fibres have passed over from the opposite side in the arcu- 
ate bundles. Penetrating. the core of the acusticum, the fibres 
are at first associated in groups, but these soon become dis- 
solved and the individual members spread through the outer 
levels. The fine terminal branches pass through the thorny 
dendritic tops of the neurones of Purkrnjz, and the final arbor- 
izations are to be frequently observed near the bodies of the 
PurKINJE cells. Such a termination is shown in Fig. 7, a. 1 7. 
The nerve-fibre divides at some distance from the cell into sev- 
eral twigs, and from the portions of those nearest the cell-body 
several small terminal twigs arise which form an arborization 
quite near to the cell. There is given in this way a direct nexus 
between the acustico-lateral fibres and the most conspicuous neu- 
rone of the tuberculum acusticum. +Other fibres of minute size 
evidently terminate in the molecular layer between the small 
molecular neurones. Even here there would be an indirect 
connection with the PURKINJE neurones, for these send their 
dendrites into the molecular layer. 
Rae he rele SER: iq Nile Sy apr gge eters 
