30 
The ridge does not necessaril}^ extend directly at right angles to the 
median line of the lateral bands, but may fall toward the median sur- 
face lines of the body; thus, in an examination of a worm mounted 
whole, one ma}" focus superficialh^ upon the margins of the true lat- 
eral band and then more deeply upon the displaced margin of this 
ridge; such change of focus gives an impression that the lateral band 
is broader than it really is. 
A longitudinal canal may be seen in transverse sections of this ridge. 
This canal can be traced on sections caudad practically to the caudal 
end of the ridge; in tracing it cephalad, some sections were found in 
which the canal could not be distinguished with 
certainty, but in the majority of the sections 
it was visible. 
Even from this rather incomplete descrip- 
tion, it is seen that the ridge is not an integral 
part of the proliferation of the subcuticula 
which forms the lateral bands 8. str.^ but rather 
an organ of glandular appearance, reminding 
the observer of the so-called cephalic gland, 
described in certain nematodes. 
Genital organs. ^ — In no specimen were 
structures found which could be positive!}^ 
interpreted as representing genital organs. One would naturall}^ 
assume that in an animal of this size there must be such organs present 
in at least an early stage of development. Probabl}- they are present, 
although thex^ could not be recognized. 
Body cavity. — The bod}- cavit}" is almost completely occupied b}^ 
the intestine, lateral ridges, and the mesh work extending’ inward from 
the muscular layer. In addition to these structures a considerable 
amount of more or less coarse!}^ granular material was found; in at least 
one instance a granular structure ( ? ? primordium of the genital organs) 
was found unilateral!}", close to the lateral band near the posterior end 
of the chyle intestine. 
Fig. 25. 
