IOWA ACADEMY OF SCIENCE 135 



by the union of branches from the first and second. In Necturus the 

 two anterior spinal nerves lack ganglia. 



LITERATURE. 



Bowers, Mary A. 



1900. The peripheral distribution of the cranial nerves of Spelerpes biline- 



atus. Proc. Amer. Acad. Arts and Sci., vol. 36. 



Coghill, G. E. 



1902. The cranial nerves of Amblystoma tigrimum. Jour. Comp. Neurol., 



vol. 12. 

 1906. The cranial nerves of Triton taeniatus. Jour., Comp. Neurol, and 

 Psych., vol. 16. 



Druner, L. 



1901. Studien zur Anatomie der Zungenbein — , Kiemenbogen — , und Kehl- 



kopfmuskeln der Urodelen. I Theil. Zool. Jahrb., Bd. 15. 



Fischer, J. G. 



1864. Anatomische Abhandlungen uber die Perennibranchiaten und Dero- 

 tremen. Hamburg. 



Kingsbury. B. F. 



1895. On the brain of Necturus maculatus. Jour. Comp. Neurol., vol. 5. 

 Lee, Stewart. 



1893. Zur Kenntniss des Olfactorius. Berichte d. Naturforsch. Gesellsch. zu 

 Freiburg I. B., Bd. 7, Heft 2. 



Xorris. H. W. 



1908. The cranial nerves of Amphiuma means. Jour. Comp. Neurol, and 



Psych., vol. 18. 



1909. The fifth and seventh cranial nerves in Plethodon glutinosus. Proc. 



Iowa Acad. Sci., vol. 16. 



1910. The cranial nerves of Siren lacertina. Proc. lovi^a Acad, Sci., vol. 17. 



1911. The cranial nerves of Siren lacertina. Science, n. s., vol. 33, no. 842. 



Piatt, Julia B. 



1896. Ontogenetic differentiations of the ectoderm in Necturus. Study II — 



On the development of the peripheral nervous system. Quart. Jour. 

 Micr. Sci., vol. 38. 



