
570 THE AMERICAN NATURALIST. [VoL. XXXVI. 
distances, and in the most successful preparations may be seen 
to join with similar branches from other multipolar cells and 
with other nerves. In some cases, as shown in Figs. 5-6, 
branches from these went directly to bipolar nerve cells or to 
large nerve trunks. These cells are always either in series 
with at least one bipolar nerve cell (Fig. 6) or have some of 
their branches joining the nerve trunk of the bipolar cell, or 
they are not far from one of these sensory cells. Often it 
was seen that these cells occupied a position closer to the 
hypodermal cells than other nervous tissues, and sometimes 
large nerve trunks would end bluntly, and under the ends of 
such trunks would be found a multipolar 
cell, perhaps giving one of its branches to 
a bipolar nerve cell (Fig. 6). 
These cells were best observed in the 
silkworm and in the myron sphinx larva, 
but they were also seen in Pieris, Datana, 
Papilio, and practically in all forms studied. 
Whether these multipolar cells are nervous 
Fic.$.—Inner face of body tissue or not cannot be fully decided as yet, 
saat oe but although they differ somewhat in posi- 
tion and staining qualities from other 
dn cl etur « undoubted nerve cells, they have many 
the hairs. (x22) Methy- characteristics which favor their being 
regarded as nervous tissue. 
Aside from a network of multipolar cells with their processes 
another sort of plexus was observed. In tiger-moth larva the 
hairs are on little knoblike elevations. After injection and 
staining of nerve fibers there are found to go to each of these 
hair tubercles a large nerve, which, after entering the elevation, 
may be seen to break up into branches (Fig. 8), and in sec- 
tions it may be seen that these branches break up still finer 
and each subdivision goes to a bipolar cell connected with a hair. 
Now, besides these larger nerve trunks, smaller ones are also 
seen entering the elevations, and often in successful prepara- 
tions near the edge of the hair tubercles there may be seen 
a very complex network of apparent nerve fibers with many 
swellings, as shown, much enlarged, in Fig. 9. This net work 




