Hekrick, Gustatory Paths in Fishes. 419 



by the Golgi sections are like the cells of the i^ranular layer of 

 the cerebellum and probably are of that type, receiving afferent 

 cerebellar impulses and transmitting them to the cortex cerebelli. 

 Whether they receive their impulses from the adjacent gusta- 

 tory nucleus or from other sources, my preparations do not 

 show with certainty, but probabl}' partly from the former. 



There is also a broad unmedullated conneciion between 

 the ventral part of the secondary gustatory nucleus and the 

 cephalic part of the n. lateralis valvulae. running cephalad 

 through the vertical cerebellar tracts (designated by b in Fig. 

 20). Horizontal sections of the brain of Catastomus show nu- 

 merous delicately medullated fibers running between the whole 

 cephalic face of the gustatory nucleus and the n. lateralis valvu- 

 lae. These connections lend further support to the belief that 

 the n. lateralis valvulae is in part a gust Uory intermediary sta- 

 tion for the cerebellum. This nucleus extends cephalad to the 

 point where the valvula severs connection with the Hoor of the 

 mesencephalon and here a large tract passes between its cephal- 

 ic end and the nuclei of the third nerve and of the fasciculus 

 longitudinalis which lie mesially of it. It is no doubt this con- 

 nection which led B. Haller to state ('98. p. 522) that the 

 "Uebergangsganglion of Fritsch and Mayser is an "upper 

 motor oculomotorius nucleus." The nucleus lateralis valvulae 



ficial origin become embedded in the most cephalic part of the secondary gusta- 

 tory nucleus, the latter being represented in the figure by the neuropil surround- 

 ing n.IV. Sections immediately caudad show the gustatory nucleus occupying 

 the entire space from near the median line to the lateral surface of the brain and 

 from the level of the commissural fibers and tr. lobo-bulbaris {tr.l.b.) up to the 

 valvula cerebelli. 



cb., ii>^ . , cl>^ . , c/>^ . , cerebellar tracts; co»i.s.g.n., commissure of the secondary 

 gustatory nuclei ; y./.w., fasciculus longitudinalis medialis ; g.III, fibers arising 

 from the granule cells of the nucleus lateralis valvulae and passing dorsally into 

 the lateral lobe of the valvula cerebelli ; ^.J., tertiary gustatory tract for the 

 inferior lobe appearing as oval bundles among the strands of the cerebellar tract 

 cb^.; Im., lemniscus (fasciculus lateralis); n.IV., root of the fourth nerve; n.l.m., 

 the extreme caudal end of the nucleus lateralis mesencephali (torus semicircularis, 

 colliculus); H.I.V., nucleus lateralis valvulae ; -f., a large blood sinus between the 

 lateral lobes of the valvula ; tcrt.opt., tectum opticum ; tr.l.b., tractus lobo-bulbar- 

 is ; tr.t.h.c, tractus tecto-bulbaris ot spinalis cruciatus; tr.t.b.r., tractus tecto-bul- 

 baris et spinalis rectus. 



