43^ "Journal of Comparative Neurology and Psychology. 



Fig. 14. Transverse section a little farther cephalad than Fig. 13 (c/. Fig. 5). Golgi method. 



X75- 



The section is slightly oblique (the right side being farther cephalad) and somewhat distorted in 

 cutting. The dotted line indicates the sagittal plane. The drawing is a composite of two adjacent 

 sections, and neurones A and B are drawn in from sections of the same series a little farther caudad. 

 .4 is a neurone of the somatic commissural nucleus, and B of the adjacent formatio reticularis. In 

 adjacent sections the dendrites of many neurones of the same type as B cross the median line in the 

 somatic portion of the commissura infima. Termini of the spinal V tract and fasciculus dorso-lateralis 

 are shown and neurites from cells of the median funicular nucleus which probably pass as internal 

 arcuate fibers to the tractus bulbo-tectalis of the other side. 



Fig. 15. Portion of a parasagittal section of the medulla oblongata of a specimen of Ameiurus 

 nebulosus 5 cm. long. Golgi method. X 75- 



The section passes through the extreme lateral edge of the left lateral funicular nucleus, showing 

 several neurones of that nucleus, with dendrites spreading out over its whole lateral face. The fascicle 

 of neurites directed dorso-caudad from these cell bodies {y) probably springs from them. These fibers 

 probably curve around to enter the tracts marked y, in Figs. 3 and 4. The commissural nucleus of 

 Cajal lies mesially of the point marked C. 



