THE EPIBRANCHIAL GANGLIA OF LEPIDOSTFUS 17 
medullated the appearance of the proximal portion of the root 
of the IX changes completely and there is no connection between 
IX and X except through the lateralis X root which runs forward 
as in Ameiurus from the lateralis X ganglion to enter near the 
entrance of the IX root. 
The glossopharyngeal ganglion contains three components, (1) 
the general visceral, (2) the placodal (special visceral or gusta- 
tory) and (3) lateralis cells. The lateralis portion of IX, in the 
10 mm. stage and in preceding stages, is quite distinct in outline 
from the visceral portion and occupies the dorso-lateral portion 
of the IX and can be positively identified by the ramus supra- 
temporalis which innervates a lateral line organ lying just lateral 
to the ganglion in the same transverse level. The anterior por- 
tion of the ganglion is composed of general visceral cells derived 
from the neural crest, and of the placodal portion which can be 
distinguished both by color and form of cells, while the posterior 
portion is composed of the general visceral cells and lateralis cells. 
Two nerves are present at this stage; the truncus glossopharyn- 
geus, arising from the anterior end of the ganglion and running 
ventrally into the first gill bar and containing probably both 
general and special visceral fibers, and a lateral line nerve, ramus 
supra-temporalis, arising from the middle of the ganglion and 
running laterally to innervate at least one lateral line organ of 
the body line which I take to be the second organ of this line. 
The vagus ganglia 
This complex (fig. 1) contains at this time three chief ganglionic 
masses (a) the lateralis X ganglion, (b) the first branchial 
ganglion and (c) a large poorly differentiated ganglion corre- 
sponding to the primordia of the general visceral (nodosal) and 
three remaining branchial ganglia. This last mass comes into 
contact with the third gill slit and contains cells contributed by 
the third placode (counting the placode of the VII as no. 1) and 
its posterior end is not clearly definable. There is no definite 
jugular, or general somatic, ganglion present at this time. It 
can be detected first in my series in a 138 mm. embryo as a 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 22, No. 1 
