172 Journal of Comparative Neurology. 



ing fibers forms arcuate fibers like those of the deep Vth. The 

 ascending fibers of part of the Vlllth. form a slender bundle 

 close to the central cavity and terminate in relation to cells 

 closely investing it. "The remainder of the Vlllth. fibers and 

 all the ascending lateral line fibers run up to the cerebellum, 

 most of them spreading out in the lateral lobes and the re- 

 mainder entering the body." Some fibers of the ventral lateral 

 line root of the Vllth. enter the so-called lobus trigemini which 

 also receives the dorsal lateral line root of the Vllth. Owing 

 to its entirely misleading character, Johnston proposes to sub- 

 stitute the name lobiis linecE lateralis for the term lobus trigem- 

 ini. Its structure is similar to that of the tuberculum acusti- 

 cum. In both are found three types of cells, (a) cells with 

 short neurites like those in the cerebellum, (b) minute cells 

 comparable with the granule cells of the cerebellum, and (c) a 

 large number of cells comparable with the Purkinje cells. 

 Kingsbury's view as to the non-identity of the lobus trigemini 

 of Acipenser with the structure of the same name in Teleosts 

 is confirmed. 



The sensory fibers of the IX and X break up in the dorsal 

 part of the lobus vagi. ' ' These fibers end in relation with cells 

 of the II type whose neurites break up mostly in the ventral 

 and lateral parts of the lobe. This part of the lobe is made up 

 of cells whose neurites take a ventro-lateral course to the lateral 

 part of the medulla. Here the fibers either pass anteriorly or 

 posteriorly without dividing, or they divide, one branch going 

 anteriorly, the other posteriorly. The smaller number of fibers 

 turn posteriorly. They form a distinct bundle of non-medul- 

 lated fibers ventral to the spinal Vth. and continue into the 

 cord. The anteriorly directed bundle runs ventral to the acus- 

 ticum to the anterior end of the medulla, where it ends in a 

 large nucleus, forming the antero-lateral limit of the medulla, 

 lateral to the median Vth. nucleus. This is the Rindenknoten 

 of Mayser and Goronowitsch." They are connected by a com- 

 missure. 



The anterior part of the lobus vagi "which corresponds 

 to the L. trigemini of Mayser is very much smaller in Acipen- 



