1. Addens, J. L.: The eye-muscle nerves of petromyzonts, especially in their general morphological significance. Proc. Kon. Akad. v. Wetensch. 31, 733 (1928).
2. Allen, C.: Studies on the spinal cord and medulla of cyclostomes. J. Comp. Neur. 26, 9 (1916).
3. Ariëns Kappers, C. U.: The structure of the teleostean and selachian brain. J. Comp. Neur. 16, 1 (1906).
4. ?: Weitere Mitteilungen über Neurobiotaxis. II. Die phylogenetische Entwicklung des horizontalen Schenkels des Facialiswurzelknies. Folia neurobiol. 2, 255 (1908).
5. ?: Weitere Mitteilungen über Neurobiotaxis. VI. The migrations of the motor root cells of the vagus group, and the phylogenetic differentiation of the hypoglossus nucleus from the spino-occipital system. Psychiatr. Bl. (holl.) 15, 408 (1911).