The adult organisation of Paragordius varius. 423 
fibre could be traced for only about half that distance. It is probable 
that such associations of these two kinds of fibres are general, but 
usually very difficult to determine. This particular fibre ran between 
the epithelial cells (Cl. Epi) of the cloaca. 
The anterior and posterior cloacal nerves (P. Cl. N Fig. 36, Pl. 39), 
previously described, are composed mainly of chromophobic nerve 
fibres, chromophilic fibres passing only a short distance into them and 
then terminating. Near their points of attachment to the ganglion 
at least the larger of these nerves contain a few scattered chromo- 
phobic nerve cells, but no such cells were seen along further points 
of their course. 
The hypodermis beneath the cloacal ganglion (Hyp Fig. 36) is 
of less height than elsewhere in this transverse plane of the body. 
Into it chromophilic nerve fibres (Chl. F) pass by way of the neural 
lamella from the ganglion. These fibres appear to end there for the 
most part ventrally; in one individual there were only three such 
fibres which bent to the right and left after entering the hypodermis. 
J. The peripheral Nervous System at the posterior End 
of the Male. 
The innervation of the vasa deferentia has been described before. 
The hypodermis (Hyp Fig. 89, Pl. 43) just below the cloacal 
ganglion (Cl. G) is thickened in the mid line, and consists there of 
1) cylindrical cuticular cells with well defined boundaries, and 2) of 
smaller more rounded cells between them (sensory cells?). From the 
neural lamella chromophilic nerve fibres pass into this hypodermis in 
considerable numbers (thus differing from the female) and bend there 
to the right and the left. 
The caudal nerves. Chromophobic nerve cells in small number 
are found along the dorsal and lateral aspects of each nerve, for 
about its anterior third; they are more numerous anteriorly. About 
200 u from the posterior end of each caudal lobe each nerve bifurcates 
into a smaller dorsal and a larger ventral branch (Cd. N Fig. 46, 
Pl. 40); more posteriorly each of these subdivides repeatedly, until 
at the posterior end of the caudal lobe the nervous tissue forms a 
thin plate along the surface of the median hypodermis (Fig. 43). 
Each caudal nerve (Cd.N Figs. 85, 86, Pl. 43; Figs. 80, 81, Pl. 42) 
is composed mainly of chromophobic (Chb. N Fig. 43, Pl. 39; Figs. 4A, 
47, Pl. 40) and chromophilic nerve fibres (Chl. F), of chromophobic 
nerve cells along its anterior third, and of chromophilic cells (Chl. C) 
Zool, Jahrb, XVIII. Abth, f. Morph. 28 
