36 F. L. LANDACRE 
(figs. 1, S.1, 2 and 3) which run toward but do not reach the 
endoderm. ‘They are certainly not motor and are apparently 
visceral sensory. Beyond this point there is given off a twig 
which runs slightly cephalad and dorsal to end on a primordium 
of a lateral line organ (fig. 1, L.1). Opposite the lateral line 
twig is given off a long motor twig (fig. 1, Mo.2) which runs 
ventral and caudad and after giving off several motor twigs 
enters the extreme end of the primordium of the hyoid muscles. 
Between the lateral lme and the motor twigs arise two large 
twigs (figs. 1, S.4 and 5) which run directly to the ectoderm. 
The ectoderm at this point is slightly thickened but not 
sufficiently differentiated to enable one to determine positively 
whether the thickening is that of a lateral line primordium or of 
gustatory organs. It has more the appearance of early gusta- 
tory organs and I have identified these twigs as visceral sensory, 
although so far as their appearance and mode of termination is 
concerned, aside from the slight thickening of the ectoderm, 
they might be general somatic sensory. ‘The evidence against 
this view rests on the absence of any recognizable somatic sen- 
sory ganglion on this nerve at this time and the absence of any 
connecting ramus from the Gasserian ganglion. This is said to 
be present in the adult. 
In view of the fact that there are said to be not only general 
somatic fibers in the VII which may come from the Gasserian 
ganglion but that in certain types such as Amblystoma (Land- 
acre, 714, note on p. 603) there are fibers of this character in the 
VII and, further, that Norris (’13) has deseribed a general cu- 
taneous ganglion on the VII, a careful search was made in the 
type plotted for such a ganglion, especially in view of the diffi- 
culty of determining ‘the character of the fibers mentioned 
above. No isolated ganglionic mass aside from those already 
described could be identified either on the 22 mm. or on older 
specimens. However, the late differentiation of the general 
cutaneous ganglia and the small size of their cells, making them 
hard to distinguish from the indifferent cells found on the roots 
of all nerves, render it unsafe to say that there are no such cells 
or fibers in the VII nerve. This interesting point must be 
