AS F, L. LANDACRE 
30. SECOND AND THIRD RAMI LATERALES X 
The lateral line trunk (figs. 1, 12 and 13, R.L.X.2) for the 
body lateral line organs arises by two rami from the dorsal and 
lateral surface, near the posterior end of lateralis X;, the gan- 
glion cells continuing caudad for a short distance beyond the 
second of the two twigs which make up this ramus. They arise 
near together and on the side plotted remain distinct but on the 
opposite side of the same embryo after a short course as separate 
twigs combine into a single ramus which retains nearly its origi- 
nal size back to the level of the middle of the yolk stalk, where 
my series ends. 
From the anterior twig several small branches run to thicken- 
ings of the skin which were identified as primordia of lateral line 
organs. 
31. THE GANGLIA VISCERALIA X; TO X, 
The visceral sensory portions of the branchial ganglia of X 
(fig. 1, G.V.X-. to X;; figs. 8 to 12, G.V.X, to X; + Fl) are all 
similar in form with the exception that the first three are much 
better isolated than the remaining two. All give rise to pharyn- 
geal and pretrematic and posttrematic rami. All these visceral 
ganglia are still attached to the epibranchial placodes of their 
respective gills and all are still receiving cells from the ecto- 
derm. The attachment of the last three is much more inti- 
mate and more extensive in proportion to the size of the gan- 
glion than that of the first two. The last two ganglia are much 
more poorly defined with more uneven borders than the anterior 
ones which are sharply isolated from the surrounding mesen- 
chyme. The first three ganglia are spindle-shaped, round in 
transverse section, placed diagonally in the body with the proxi- 
mal end slightly anterior, and end distally in the enlargement 
formed by their fusion with their epibranchial placodes. 
The posterior extremities of the last two are similarly attached, 
but these two ganglia are fused in their proximal portions. 
From the point of attachment of each ganglion to its placode 
there is a large cellular mass which extends caudad from the 
main body of the ganglion. This mass presumably will be 
