26 H. BERKELBACH VAN DER SPRENKEL 
vestibular root [fig. 11 (11)], the second one lying more laterally 
coming from the posterior vestibular root [fig.11 (13)], and the third 
one still more laterally coming from the first root [fig. 11 (12)]. 
The second one descends farther caudally than the first one 
and can be traced as far back in the gray substance of the 
lobus lineae lateralis anterioris as the crista which covers it. 
MORMYRUS CASCHIVE 
Whereas in Silurus glanis I dealt with an animal whose taste 
organs, especially those supplied by the VII nerve, were very 
highly developed, Mormyrus gives me the opportunity of de- 
scribing an object in which the lateral nerves, notably the nervus 
lateralis posterior, are hypertrophied. 
In studying this animal I have come to conclusions which are 
entirely different from those of Sanders and Victor Franz.” 
These conclusions appeared to me to be in accord with the 
fundamental division made in the sensory regions of the bulb 
by the American school, especially by Strong,?’ Herrick? and 
Johnston.?° 
Mormyrus resembles Silurus in so far as its optic system is 
poorly developed, being even smaller than in the latter. 
The oculomotor nerve enters the brain as usual in the cleft 
between the inferior lobes and the base of the midbrain (fig. 12). 
The nerve is so small that its central relations cannot be de- 
tected with accuracy. It seems to me that the root arises from 
a small medial nucleus dorsally of the ganglion interpedunculare 
and probably also from a nucleus that has a more dorso-lateral 
25 Sanders, Contributions to the anatomy of the central nervous system in 
vertebrate animals. The brain of the Mormyridae. Phil. Trans. Roy. Soc. 
London, no. 173, p. 927, 1883. 
26 Das Mormyridenhirn, Zool. Jahrb, Bd. 32, 1912, pp. 465-492. 
27 The cranial nerves of the Amphibia. Jour. Morph., vol. 10, 1895. 
28 ©. J. Herrick. See especially The cranial and first spinal nerves of Menidia. 
Jour. Comp. Neur., vol. 9, 1909, p. 153. Ido not agree, however, with this author 
in his conclusions regarding the valvula cerebelli published in his work on the 
gustatory paths (Jour. Comp. Neur., vol. 15, 1905), which are due in considerable 
part to a wrong interpretation of these bulbar centers given by Sanders (loc. cit.). 
29 Johnston. See especially, An attempt to define the primitive functional 
divisions of the central nervous system. Jour. Comp. Neur., vol. 12, 1902. 
