The adult organisation of Paragordius varius. 415 
the neural lamella is here continuous and connects the ganglion with 
the hypodermis below and behind it. 
The lamella is also continuous below the ganglion of the male 
(Cl.G Figs. 87, 89, Pl. 43), but since in this sex the cloacal ganglion 
bifurcates posteriorly to form the two caudal nerves, its neural lamella 
also bifurcates, so that each caudal nerve in its anterior portion has 
its own neural lamella, connecting it with the hypodermis (Fig. 86, 
Pl. 43). The neural lamella decreases in height as the nerve passes 
further caudad (Fig. 85), and finally disappears so that the nerve lies 
directly against the hypodermis (Fig. 43, Pl. 39; Fig. 46, Pl. 40). The 
posterior portions of these nerves have thus retained their primitive 
hypodermal connection. 
F. The longitudinal Hypodermal Nerve. 
The point of attachment of the neural lamella (N. Z Figs. 22, 24, 
25, Pl. 38; Fig. 26, Pl. 39) to the hypodermis is conical on cross 
section, the cytoplasm there appears clear and structureless, and in 
this clear space lie nerve fibres (L.H.N) which course longitudinally 
in the inner portion of the hypodermis in the medio-ventral line. This 
may be called the longitudinal nerve of the hypodermis. It is com- 
posed of nerve fibres alone, no nuclei occurring within it; the nerve 
fibres are from the chromophilic nerve cells situated within the ventral 
nerve cord. On cross sections these fibres appear as deep black 
granules lying in a clear substance. Whether chromophobic fibres also 
occur in this nerve could not be satisfactorily determined. As will 
be shown more fully later, nerve fibres from the nerve cord pass by 
means of the neural lamella into the hypodermis, there some of them 
enter into the constitution of the longitudinal nerve, while others turn 
off to the right and left to terminate in plexuses in the hypodermis. 
Since the number of nerve fibres found within the longitudinal nerve 
is always small on a given cross section, it is probable that such 
fibres course only short distances within the nerve and then leave it 
to end in the hypodermis. 
The longitudinal hypodermal nerve is found as far as the neural 
lamella extends, that is also beneath the cloacal ganglion (L.H. N 
Fig. 36, Pl. 39), and in the male it posteriorly subdivides into two, 
accompanying the divisions of the neural lamella into the tail 
lobes. 
