102 journal of Co?nparative Neurology and Psychology. 



becomes medullated later than the mesencephahc system and 

 consists of finer less heavily medullated fibers, it is better to regard 

 the thalamo-spinal tract as a separate tract. 



A tectal root of the trigeminus does not occur either in the tele- 

 osts or in the selachians. 



Researches on the peripheral and central nervous system of the 

 teleosts and the selachians suggest that the tongue of higher verte- 

 brates has a single sensory nucleus as taste nucleus, with which it 

 is connected, partly by the nervus glossopharyngeus and partly 

 by the pars intermedia Wrisbergii of the facialis. 



The selachians and teleosts have a stato-motor fiber system 

 which connects the whole static center (the center of the N. octavus, 

 NN. laterales and the cerebellum) with the motor nuclei of mid- 

 brain, oblongata and spinal cord, running with decussation through 

 the fasciculus longitudinalis posterior. 



Descending vagus or glossopharyngeus fibers do not occur 

 either in the teleosts or in the selachians. 



The commissura infima Halleri of the teleosts and selachians 

 contains secondary vagus fibers, but no direct root fibers. 



