No. 1.] AMPHIBIAN BRAIN STUDIES. 37 
The Relation of the Commissures of the Brain to the Formation of the 
Encephalic Vesicles. Proc. Amer. Assoc. Adv. Science, August, 1887; published 
March, 1888, p. 262. Also, American Naturalist, October, 1887, p. 941. 
RAuBER. Die Lehre von dem Nervensystem und den Sinnesorganen, (Anat. des 
Menschen). 1886. 
SPITZKA. Contributions to Encephalic Anatomy, in nine parts. Journ. of Nerv. and 
Mental Disease. New York. 
STIEDA. Ueber den Bau des centralen Nervensystems der Amphibien und Rep- 
tilien. Zeits. f. wiss. Zod]. Band XX. 
Ueber den Bau des centralen Nervensystems des Axolotls. Zeits. f. wiss. 
Zool. Band XXV. 
WILDER. The Dipnoan Brain. American Naturalist, June, 1887. 
“Anatomical Technology; ” also shorter papers upon the structure and nom- 
enclature of the Brain. 
APPENDIX. 
1°. Figure 2. A vertical section of the Brain of a Reva embryo, at the period 
of the formation of the encephalic commissures, cé/, pcm, scm. Lettering as in the 
Explanation of Plates. 
Fig. 3. A horizontal section of the same, composed from two levels, showing the 
relation of the commissures to the encephalic vesicles, 
2°. Fischer (op. cit. p. 135) upon the distribution of the Facial 
and Trigeminal Nervesin Cryptobranchus. The FAcrA divides into 
four main branches: R. palatinus; R. mentalis passes the mylohyotdeus 
muscle and terminates in the skin of the lower jaw (sensory); R. alveolaris to 
the skin above the masseter muscle (sensory); R. jugularis to the mylohyotdeus 
posterior and digastricus muscles (motor). The TRIGEMINUs has three branches: 
5", a, retractor bulbi, rectus externus and superior, obliguus superior (motor, 
including Abducens); 4, skin of forehead, olfactory chamber, snout and superior 
maxilla (sensory) ; 5’ to skin over premaxilla; 5/’/’, 2, to masseter and temporal 
muscles (motor); 4, skin covering inferior maxilla (sensory). It will be observed 
that this distribution of the Facial is largely sensory and is consistent with the 
derivation of the main sensory elements of both nerves from the dorsal sensory 
nucleus, as I have described them. It also demonstrates that the lower bundle of 
the Facial is eertainly motor. 
3°. The Miillerian fibres and posterior longitudinal fasciculus. 
As shown in Fig. 11 (Plate V.), these two systems are apparently distinct. The 
Miillerian fibres are observed at the lowest medulla levels as a compact round 
