422 'Journal of Comparative Neurology and Psychology. 



Fig. I. Transverse section through the spinal cord of an adult specimen of Ameiurus nebulosus 

 about 20 cm. long, stained by the method of Weigert-Pal. Figs, i to 6 are drawn from the same 

 series of sections, all to the same scale. The first section is taken at the level of the second spinal nerve. 



X 35- 



c.d., cornu dorsalis; com.d., commissura dorsalis; j.d.L, fasciculus dorso-lateralis; /./., fasciculus later- 

 alis; /./.m., fasciculus longitudinalis medialis;/.n. J., funiculus dorsalis ;/.r.J.,formatio reticularis dorsalis; 

 tr.sp.tec, tractus spino-tectalis (lemniscus); 2 sp.d., dorsal root of second spinal nerve. 



Fig. 2. Section through the spinal cord of Ameiurus at the level of the first spinal nerve. At this 

 level the dorsal cornu has enlarged and separated into two nuclei, the median funicular nucleus 

 and the nucleus of the spinal V tract. The funiculus dorsalis at this level contains both ascending 

 fibers from the spinal cord for the funicular nuclei and descending fibers from the spinal V tract. The 

 fasciculus dorso-lateralis contains chiefly ascending fibers from the spinal cord for the funicular nuclei, 

 but also some descending secondary gustatory fibers from the facial lobe. X 35. 



com.d., commissura dorsalis; f.d.L, fasciculus dorso-lateralis; /./., fasciculus lateralis; f.l.m., fasciculus 

 longitudinalis medialis; fn.d., funiculus dorsalis and spinal V tract; /.r., formatio reticularis; f.r.d., dorsal 

 part of the formatio reticularis which is related to the funicular nucleus; f.v., funiculus ventralis; n.fn.m., 

 median funicular nucleus; n.sp. V., spinal V nucleus and dorsal cornu; tr.sp.tect., tractus spino-tectalis 

 (lemniscus); tJ.c, ventral cornu; I. i/). if., dorsal root of first spinal nerve; i.5/).i'., ventral root of first 

 spinal nerve. 



