416 ‘THOS. H. MONTGOMERY jr., 
G. The peripheral Nervous System of the Trunk. 
The following description applies most particularly to the female, 
where these anatomical relations were more thoroughly examined than 
n the male. And first will be described the region of the body 
between the cephalic ganglion and the cloacal ganglion. 
Chromophilic nerve fibres of the hypodermis. These 
(Chl. F Figs. 22, 24, 25, Pl. 38; Fig. 26, Pl. 39) are the processes of 
chromophilic nerve cells of the ventral cord, which enter the hypo- 
dermis (Hyp) by way of the neural lamella (N.L); and they appear 
to come mainly if not wholly from those cells which have a more 
ventral position in the nerve cord. On entering the hypodermis some 
of these bend and course longitudinally: these are the ones which 
compose the hypodermal longitudinal nerve already considered (L. H. N). 
The others on entering the hypodermis bend to the right and left 
and then course in the hypodermis along the sides of the body. These 
fibres, which appear very sharply marked on iron-haematoxylin staining 
as deep black threads in the much paler hypodermis, ramify at their 
ends, that is break into plexusus (Figs. 22, 25). In one case such a 
fibre was traced from the ventro-median line to a point about half 
way in the hypodermis between the dorsal and ventral side of the 
body before ramifying, but as a rule the fibres subdivide into plexuses 
in the ventral and ventro-lateral hypodermis (Figs. 27, 28, Pl. 39). 
Before ramifying they lie in the hypodermis close to its inner margin, 
and take in general a straight course. These fibres are smooth and 
dense and highly refractive. A comparatively small number of them 
show, close to the point of departure from the neural lamella, lenti- 
cular thickenings of the same refractive appearance as the remainder 
of the fibre (Chi. F Fig. 28); I could not determine the nature of 
these thickenings, beyond that they are not nuclei, and probably are 
not artefacts since they are found on only a small number of the 
fibres and after both alcohol and formalin fixation. 
On entering the hypodermis and there turning to the right or 
left, these chromophilic nerve fibres run for a varying distance, then 
subdivide into plexuses. These plexuses become gradually indistinguish- 
able from the cytoplasm of the hypodermal cells as they become 
smaller (Fig. 22, Pl. 38; Figs. 27, 37, Pl. 39). It could not be well 
determined whether these plexuses end in or around the hypodermal 
cells, since with the degree of destaining necessary to show the nerve 
fibres with sharpness the boundaries of the hypodermal cells cannot 
