422 'Journal of Comparative Neurology and Psychology. 



Fig. I. Parasagittal section through the oblongata of a specimen of Ameiurus nebulosus about 2 

 cm. long, showing the visceral commissural nucleus and the secondary tract from it to the formatio 

 reticularis. Golgi method. X42. 



Fig. 2. Section through the widest part of the somatic commissura infima and funicular nuclei of 

 the adult Ameiurus nebulosus. Method of Weigert-Pal. X35. From the Journ. Comp. Neurol, 

 and Psychol., vo\. 16, p. 425 (Herrick '06, Fig. 4). 



The lateral funicular nucleus appears external to the spinal V tract and its nucleus, receiving many 

 fibers from the fasciculus dorso-lateralis and sending large tracts to the formatio reticularis and the com- 

 missura infima. This commissure receives also a large mass of fibers from the median funicular nucleus 

 and probably also from the spinal V nucleus. Fibers are seen passing from the spinal V tract into its 

 nucleus, and some pass through this nucleus to end in the median funicular nucleus. 



com. inf., somatic part of commissura; j.d.l., fasciculus dorso-lateralis; /./., fasciculus lateralis; 

 f.l.m., fasciculus longitudinalis medialis; f.r., formatio reticularis; /. v., fasciculus ventralis; n.amb., 

 caudal end of nucleus ambiguus; n.jn.l., lateral funicular nucleus; n.fn.m., median funicular nucleus; 

 n.sp.V., spinal V nucleus; s., secondary tracts from spnial V nucleus and median funicular nucleus; 

 sp.F.tr., spinal V tract; tr. sp.b.tect., rectus spino- et bulbo-tectalis (lemniscus); to. tractus bulbo-spinalis; 

 X., tractus spino-cerebellaris; y., secondary tracts from lateral funicular nucleus and other elements 

 for the commissura infima; cf. Fig. 3. 



