72 "Journal of Coynparative Neurology and Psychology. 



fasciculus longitudinalis posterior," which he thinks originate 

 from the region of the trochlearis, while Haller saw in this 

 bundle indirect decussated connections of the cerebellum with the 

 motor seventh nerve. 



Regarding my own results, I can confirm Van Gehuchten's 

 information that this tract both in the teleosts and in greater 

 measure in the sharks increases as it passes caudad, particularly 

 near the origins of the fifth and seventh nerves. The fascicle 

 receives fibers from all motor nerves, as well as from the continua- 

 tion of the ventral motor column, which is situated in front of the 

 trigeminus and of which Haller also speaks (Figs. Ixxxviii, 

 Ixxxix). The course of the motor fibers of the fasciculus dorsalis 

 is frontal in almost all cases, as the motor nucL,,':e for the greater 

 part behind the entrance of their roots. This particular relation 

 of the motor nuclei to their roots has also been stated by John- 

 ston. He justly observes that the only exception to the rule is a 

 part of the fibers of the trigeminus. In the facialis the difference 

 in position is greatest. 



These decussating motor fibers form the first group constituting 

 the fasc. long, dorsalis. To these we must undoubtedly add still 

 other connections between the motor nuclei themselves which 

 permit the coordinated functions of the different muscles of the 

 eyes. 



Its second group comprises fibers belonging to the static centers, 

 the cerebellum and the acustico-lateralis center covered by the 

 cerebellar crest; The cerebellum gets its connection with the 

 fasc. long, posterior later than the regio acustico-lateralis; for, 

 while in all adult fishes examined both groups of fibers were 

 present, the cerebellar group was lacking in the immature Lophius. 

 The fibers which have already been mentioned by Goronowitsch 

 and Johnston for Acipenser must be regarded as the most ante- 

 rior members of this cerebellar group. They are found at the 

 junction of the mesencephalon and the oblongata, and crossing 

 through the fasc. long, posterior, disappear in the region of the tro- 

 chlearis nucleus, just as Johnston found it in Acipenser. I have 

 already mentioned this in Chapter HI. 



I am not so sure, however, about the character of these fibers 

 as I am of the compact medullated tracts which, coming from the 

 fasc. long, posterior, pass in an elegant curve (marked fj in Fig. 

 Ixxxvi, Plate VI) mesad of the lobo-cerebellar fibers, after the 



