The visceral ganglion of Pecten, etc. 
13 
must not be concluded that the peripheral nerves or visceral connectives 
contain no other fibrillae. 
The most ventral parts (just below the cortex) of the ventro-central 
lobe contain fine fibres crossing chiefly from right to left' but not col- 
lected into a definite tract. 
A little dorsal to this layer there is a very distinct bundle of fibres 
(figs. 5,8 and textfig. tr.f) which passes right through the centrai part 
of the ganglion, from right to left and approaches the ventral surface 
where the ventro-central lobe adjoins the lateral grooves (fig. 5 tr.f). 
Just before reaching this point, the bundle breaks up into several 
branches (fig. 5) which radiate out dorsal to the lateral grooves and 
into the lateral lobes, branching stili further on their way until the 
fibrillae are lost in the neuropill of the latter. 
This tract of fibres which is the most distinct in the ganglion is pro- 
bably the same as that seen by Kawitz and incorrectly designated as 
the crossing of the fibres of the branchial nerves, though no reasons nor 
figures are given in support of this view. 
The more dorsal parts of the visceral ganglion are made up to a 
large extent of nerve fibres and axones running in definite tracts and 
finally leaving the ganglion by some nerve. The fibres entering in the 
cerebro-visceral connective have been traced in some cases to ganglion 
cells, in other cases they have been found to pass through the ganghon 
