44 F, L. LANDACRE 
X;. This nerve is identified provisionally as the ramus auricu- 
laris. Both the jugular ganglion and its nerve are surprisingly 
small and there seems to be a large amount of ectoderm on the 
posterior portion of the head devoid of general cutaneous in- 
nervation at the stages studied. Both the nerves identified as 
supratemporal rami were carefully examined for general cu- 
taneous fibers without success. The morphology of the r. au- 
ricularis X has been treated fully by Herrick (99, p. 267-273). 
A more detailed description of this nerve requires older. material 
than that at my disposal. 
25. THE GANGLION LATERALE Xi 
There are three lateral line ganglia on the Xth nerve occupy- 
ing the proximal portions of the first four branchial ganglia 
which will be designated in the description as Laterale X4, X», 
“and X; respectively. The most anterior or laterale X, (figs. 1 
and 7, G.L.X,) is situated on the proximal portion of branchial 
X,. It extends from the anterior end of the jugular ganglion 
ventrally and caudally along the root fibers of branchial X, 
almost to the proximal end of the ganglion viscerale X,. It 
does not at this stage come into contact with that ganglion, 
there being a short fibrous root of viscerale X; containing no 
cells. On its proximal end it is in contact with the jugular 
ganglion to which it is ventral in position. 
Throughout the whole length of the lateralis X, ganglion the 
root of the ganglion viscerale X, and motor X le mesial to it. 
This ganglion is compact and nearly round in transverse sec- 
tion except at the origin of two lateral line rami, where a large 
mass of cells projects laterally toward the ectoderm making the 
ganglion triangular in form. Its cells are large and readily 
distinguished from those of the jugular X, with which it is in 
contact dorsally. The cells of this lateral line ganglion are not 
readily distinguished from those of the visceral ganglion, but 
this produces no confusion here since these two ganglia are not 
in contact. 
