The Journal of 



Comparative Neurology and Psychology 



Volume XVIII DECEMBER, 1908 Number 6 



THE CRANIAL NERVES OF AMPHIUMA MEANS. 



BY 



H. W. NORRIS. 



With Plates IV, V, VI, VII and VIII. 



1. Introductory 5^7 



2. The olfactory nerve 5^8 



3. The optic nerve 5^^ 



4. The eye-muscle nerves 5^9 



5. The trigeminal nerve 53° 



a. The roots of the trigeminal nerve 53° 



h. The ramus mandibularis V 53 ' 



c. The ramus ophthalmicus profundus V 533 



d. Trigeminal fibers entering the dorsal VII 53^ 



6. The facial and auditory nerves 53^ 



a. The roots of the facial and auditory nerves 53^ 



h. The lateral Hne components of the facial nerve 537 



c. The ramus buccalis VII, and ramus maxillaris V 53^ 



d. The ramus ophthalmicus superficialis VII, and ramus oticus 539 



e. The ventral trunk of the facial nerve 54° 



/. The ramus palatinus VII ■ 54° 



g. The ramus alveolaris VII 54° 



h. The rami mentalis externus and internus VII 54' 



/. The ramus jugularis VTI 54^ 



k. The ramus lateralis VII 54^ 



7. The glossopharyngeal and vagal nerves 544 



a. The roots of the IX-X complex 544 



h. The ramus communicans cum faciali 545 



c. The rami supratemporalis and auricularis X 54^ 



d. The glossopharyngeal ner\'e 54^ 



e. The second and third branchial nerves 55° 



/. The rami laterales X 55' 



g. The ramus intestino-accessorius X 55' 



8. The first and second spinal nerves 55^ 



9. Concluding statements 553 



10. The liter.ature cited 554 



u. Explanation of the plates 556 



I. INTRODUCTORY. 



The only descriptions of the cranial nerves of Amphiuma, v^^ith 

 the exception of more or less incidental mention, are to be found 

 in the papers of Fischer (1864), Wilder (1892), Kingsley 

 (1902a), and Druner (1904), but none of these attempts a system- 

 atic account from the standpoint of nerve components. 



