446 THE NERVOUS SYSTEM. 
This view agrees with that of Yung [179], who compares these 
structures with the trabecula and corpus fungiforme (‘ corps en 
gobelet’), whilst he recognises the complexity of their connec- 
tions with the rest of the brain. 
The optic peduncle (0) in the Crayfish arises partly from the 
mesocerebron, although its principal origin appears to be from 
the thalamic lobe (th). Berger [178] indeed regards the corpus 
fungiforme as the optic lobe ; and Yung [179] says, ‘ We re- 
gard the lateral ganglia (i, m’) as the optic lobes par excel- 
lence. From the context it is evident, I think, that he includes 
the corpus fungiforme as part of the lateral ganglia. Berger 
held the same opinion. 
Bellonci [183], however, considered the corpus fungiforme as 
representing the cerebral lobes of the vertebrate—an opinion 
which corresponds with the views of Dujardin [170] and 
Faivre [171]. 
Rabl-Riickhard* observed that the corpora fungiformia are 
perfectly normal in the blind ants of the genus Typhlopone, 
and argues from this that they cannot be optic lobes, as Berger 
supposes. 
My own view is that the corpus fungiforme, or corpora fungi- 
formia—for these organs are usually two in number on each 
side—are not to be regarded as part of the basal ganglia from 
which the optic nerves are derived, but should rather be con- 
sidered as similar to the cerebellum of vertebrates, or, to use 
the nomenclature of Meynert,t as part of the cerebro-cerebellar 
projection system. 
I shall endeavour to show hereafter that their connections 
with the rest of the cephalic centres resembles in many points 
those of cerebellum in vertebrates. 
It is interesting to observe that the optic tract in the Crus- 
tacea appears to arise mainly from the thalamic lobe; whilst 
in Insects its connection with the thalamic lobe is less easily 
seen, and it arises mainly from the mesocerebron. Thus there 
* Rabl-Riickhard, ‘ Studien iiber Insectengehirne,’ Archiv f. Anat. Physio- 
logie u. w. Medicin, 1875. p. 488. 
+ Sitzungsberichte d. k. Acad., Wien, 1869. 
