210 J. B. JOHNSTON, 
cells with richly branched dendrites and thick neurites which enter 
the Haubenkreuzung, and smaller cells with short neurites. The 
bundles of MEYNERT present more complicated endings in the 
ganglion than in lower Vertebrates. The fibres give off few collaterals 
as they enter the ganglion, cross to the opposite side and after a 
longer or shorter course cross back again, and may cross and re- 
cross the middle line several times. In the latter part of their course 
the fibres give off numerous collaterals which break up among the 
cells of the ganglion, and the fibres finally terminate in two or 
three branches. In addition to the bundles of MEYNERT a smaller 
number of coarser fibres enter the ganglion interpedunculare from 
the overlying white substance and break up in an extensive and 
complex end-branching. The source of these was not made out. 
KÖLLIKER’s studies of the ganglion interpedunculare in Mammals 
gave results agreeing on the whole with those of CaJaL, although 
not so detailed. In man, however, KOLLIKER finds that the ganglion 
is wholly lacking and that the bundles of MEYNERT appear to be 
in a degenerating condition. 
EYCLESHYMER & Davis (97) in studying the development of 
the epiphysis and paraphysis in Ama, “found nerve fibres passing 
from the superior commissure into the stalk of the primary vesicle” 
and also into the secondary vesicle (primary and secondary epiphyses). 
This confirms the results of CHARLES HILL (94) on Teleosts and 
Ama, except that Hitt followed the nerve fibres to the posterior 
commissure. 
HALLER (98) states that in Salmo the bundles of MEYNERT 
receive some fibres from the region of the ‘tween brain behind the 
ganglia habenulae, and end in the corpus interpedunculare as de- 
scribed by MEYNERT (Mammals), VAN GEHUCHTEN and EDINGER. 
EDINGER in his last paper on the ’tween brain of Reptiles (99) 
says that the tractus habenulo-peduncularis comes mostly from the 
inner (anterior) part of the ganglion habenulae, and describes several 
other bundles to and from the ganglion. The course and ending 
of the bundles of MEYNERT are described as in the same author’s 
earlier papers, and reference is made to the work of VAN GE- 
HUCHTEN and CaJAL, with which EDINGER’s results agree. 
EDINGER & WALLENBERG (99a) working independently on the 
pigeon, one by the methods of WEIGERT and GOLG1, the other by 
the degeneration method, find that the tractus habenulo-peduncularis 
ends in part in the capsule of the nucleus rotundus, the remainder 
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