82 'Journal oj Comparative Neurology and Psychology. 



Fig. 3. A photograph of a dissection of a brain of a large specimen of Gadus morrhua. X i-3- 



The cerebellum and a portion of the tubercula acustica have been dissected away, the cut surfaces 



being indicated by parallel shading on the accompanying outline. The dissection exhibits the relations 



of the lateral and median vagal lobes and the commissural nuclei. For the internal connections of 



these structures compare Fig. 2 and the following figures of cross sections. 



Fig. 4. Transverse section through the medulla oblongata of Gadus morrhua. X 35- 

 The section is taken through the middle of the vagal lobes and illustrates the relations of their median 

 (visceral) and lateral (somatic) lobules. Vagus root fibers are seen entering the median lobule on its 

 lower border. Secondary facialis tracts pass from the lateral lobule to the ventral funiculi and from 

 the median lobule to the ascending secondary gustatory tract. Dorsally of the latter is the fasciculus 

 dorso-lateralis, containing the spinal V tract, tracts between the oblongata and the spinal cord and 

 probably the tr. spino-cerebellaris. 



Figs. 4 to 8 are taken from a single series of transverse sections of an entire fish 7 cm. long, fixed 

 in Flemming's stronger fluid and stained by the method of Weigert. The external form of this young 

 brain does not differ materially from that of the very large adult shown in Fig. 3. 



