The adult organisation of Paragordius varius. 413 
of the eye, and a thin layer of this tissue extends between the vasa 
to form a thin lining to the dorsal wal! of the ganglion, here separating 
the ganglion from the parenchym (Par) which envelopes it at all 
other points. These small nerves which innervate the vasa deferentia 
may be called the genital nerves. 
Just anterior to the vertical arm of the cloaca the ganglion divides 
into a right and a left caudal nerve (Cd. N Fig. 81, Pl. 42). Each 
of these courses caudad within the caudal lobe of its side of the 
body, and is situated medio-ventrally close to the thickened portion 
of the hypodermis of the tail lobe (Cd. N Fig. 85, Pl. 43). These 
nerves may be traced to the posterior ends of the lobes, and each 
becomes most posteriorly a thin nervous sheet on the median side of 
the tail lobe (Fig. 43, Pl. 39); their relations to the hypodermis will 
be described later. 
These are the only nerves arising from the ganglion in the male. 
The finer structure of the ganglion (Fig. 89, Pl. 43) is very 
similar to that of the ventral cord. The chromophobic nerve cells 
(Chb. C) are placed medio-ventrally and laterally on the periphery of 
the ganglion, but are two or three layers deep on the sides. Giant 
cells occur medio-ventrally, and in one individual at least ten of these 
were counted. The chromophobic cells do not extend into the caudal 
nerves. The chromophilic cells are placed ventrally. Their fibres 
radiate upwards and outwards from the region of the neural lamella, 
and also longitudinally, but are not so numerous as in the nerve cord; 
they produce a narrow transverse commissure at the point of bifur- 
cation of the caudal nerves, and another at the anterior end of the 
ganglion (this one corresponding to the only one of the female). Most 
of the nerve fibres of the ganglion are chromophobic fibres. 
E. The Neural Lamella. 
In both sexes from the cephalic ganglion to the posterior end of 
the cloacal ganglion the ventral nerve cord is attached to the hypo- 
dermis by a median unpaired lamella, the neural lamella (NV. Z Figs. 2, 
314, Pl. 3798185522524, Pl38- Big, 26, Pl 39:7 Pl. 43), Anal 
these regions this lamella appears to be continuous and not interrupted 
nor segmented; at least no such interruptions were seen in any region 
of the body, and on longitudinal sections (Figs. 2, 3, Pl. 37; Figs. 31, 
33, Pl. 39) as well as upon dissected specimens it seems perfectly 
continuous. Thus the lamella attaches the nerve cord to the hypo- 
dermis, from which the nerve cord had split off; and the lamella is 
