20 H. BERKELBACH VAN DER SPRENKEL 
in the usual way by a fusion of its crista cerebellaris with the 
lamina molecularis cerebelli (fig. 6). The medial lobe (the 
one belonging to the anterior lateral nerve) continues still a 
certain distance rostrad beneath the cerebellum and its con- 
nection with the lateral lobe, then fuses with the contralateral 
medial lobe and finally fuses also with the cerebellum, its crista 
connecting with the lamina molecularis cerebelli (fig. 5). By 
the larger caliber of its parallel fibers and their different color the 
crista of the medial lobe can be still distinguished from the lobus 
nervi lateralis posterioris throughout many sections. 
_ The most important alteration which occurs rostrad is the 
considerable increase of the granular layer of the lobi, chiefly 
of their lateral parts (eminentia granularis cerebelli, Franz) causing 
an increase of the dorso-lateral part of the bulb, which is specially 
striking in siluroids and continues dorsad and frontad into the 
corpus cerebelli, which, in contrast with most other teleosts, has 
grown out in the frontal instead of the caudal direction. 
The nervi laterales themselves show the following course (cf. 
the scheme, fig. 11): 
The nervus lateralis posterior is a strongly developed root of 
medium sized fibers. It enters the medulla in the typical way, 
shifting gradually inward and upward (fig. 10). It is soon 
covered with the crista, from which in more frontal sections it is 
again farther separated by the considerable development of the 
granular layer. 
More rostrally the crista, and also the granular layer, and the 
fibers of the nervus lateralis posterior then form a flat layer 
(fig. 6) of white substance on the latero-dorsal border of the lobe, 
the ventral part of which then contains also fibers of the nervus . 
lateralis anterior. 
In more frontal levels the crista on these fibers disappears 
(fig. 5), the gray substance belonging to the posterior lateral 
nerve decreases, and the bundle on the lateral border—split up 
by several cerebellar systems—terminates in the adjacent gray 
matter laterally of the cerebellum. These relations are in har- 
mony with those found by Tello in the carp, where also bulbar 
and cerebellar fibers could be distinguished. The descending 
