GANGLIA OF RANA 481 
this stage in Lepidosteus, Ameiurus and the frog there is a stage 
when the ganglia are better defined, have clean cut boundaries 
and give rise to fibrillated nerves, usually well isolated from each 
other; following this stage the ganglia fuse together more or less, 
their nerve trunks combine and they must be isolated largely by 
the difference in size of their nerve fibers. Evidently the second 
stage is the one most favorable for determining the number and 
position of ganglionic components and this stage can be found 
only when the series is complete and taken at close intervals. 
LITERATURE CITED 
Coeuitt,G.E. 1902 The cranial nerves of Amblystoma tigrinum. Jour. Comp. 
Neur., vol. 12, no. 3. 
Gaupp, E. 1896 In A. Ecker’s and R. Wiederscheim’s Anatomie des Frosches. 
Braunschweig. 
Herrick, C. J. 1894 The cranial nerves of Amblystoma. Jour. Comp. Neur., 
vol. 4. : 
1899 The cranial and first spinal nerves of Menidia. Jour. Comp. 
Neur., vol. 9, no. 3. 
Lanpacre, F. L. 1910 The origin of the cranial ganglia in Ameiurus. Jour. 
Comp. Neur., vol. 20. 
1912 The epibranchial placodes of Lepidosteus osseus and their rela- 
tion to the cerebral ganglion. Jour. Comp. Neur., vol. 22, no. 1. 
Norris, H. W. 1908 The cranial nerves of Amphiuma means. Jour. Comp. 
Neur., vol. 15, no. 6. 
StronGc, Outver 8. 1895 The cranial nerves of Amphibia. Jour. Morph., vol. 
10, no. 1. 
Wiper, H. H. 1892 Die Nasengend von Menopoma alleghanense und Amphi- 
uma tridactylum nebst Bemerkungen iiber die Morphologie des R. 
ophthalmicus profundus trigemini. Zool. Jahr., Abth. f. Anat. n. 
Ontog., Bd. 5, Heft. 2. 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 22, No. 5 
