The adult organisation of Paragordius varius. 417 
be distinguished: but in no case were special end knobs or varicosities 
seen as terminations of these plexuses. These fine terminal plexuses 
can be followed upwards in the hypodermis of the sides of the body, 
and more rarely can be seen even on the dorsal side. Apparently 
there are as many such plexuses as there are nerve fibres entering 
the hypodermis. In the most anterior region of the trunk, where the 
ventral hypodermis is particularly thickened, many of the chromophilic 
nerve fibres pass into the hypodermis directly from the neural lamella, 
and without first turning to the right or left, ramify in the hypo- 
dermis just beneath the neural lamella (Fig. 27, Pl. 39). So far as 
could be determined the whole of these plexuses lie within the hypo- 
dermis, and no evidence was found that branches are given off from 
them either into the cuticula without or into the musculature within. 
The finest end ramifications of the plexuses are in general placed 
nearer the outer than the inner border of the hypodermis. On ac- 
count of the restriction of these chromophilic elements to the hypo- 
dermis, and in view of other evidence to be detailed below, it is very 
probable these elements are not motor but sensory. 
The distribution and number of those chromophilic nerve fibres 
which on entering the hypodermis turn to the right or left was care- 
fully plotted on a number of series of sections through various portions 
of the body of a large female. In 268 sections (each section of 
62/, u thickness), 43 were found on the left side and 32 or 33 on 
the right. In each case the nerve was counted by considering only the 
point of its bending within the hypodermis, so as to exclude the 
possibility of counting separate parts of one nerve as different nerves. 
The largest number found on any twenty consecutive sections was 13, 
the smallest number, 3. These nerves are by no means regularly 
paired. Thus of the 75 or 76 nerve fibres entering into the above 
count, only 10 were paired in such a way that on the same cross 
section one would be found on the right and another on the left. In 
some cases aS many as five succeed each other on one side of the 
hypodermis before one appears on the other side; sometimes right 
and left fibres alternate. In the anterior trunk region of another in- 
dividual they were found to be somewhat more numerous and more 
regularly disposed; thus in one series of this region (sections in this 
case 10 u thick) there were found in 61 consecutive sections, 40 nerve 
fibres on the left and 32 on the right; and in another series of 85 
consecutive sections, 39 on the left and 41 on the right. In this 
series almost every section showed such a nerve fibre, and on some 
