59 
shaped; its walls are thickened, smooth, and devoid of teeth. The 
æsophagus is of about equal width throughout the greater part of 
its length; only in the proximal third it increases towards its base 
where it is somewhat expanded without forming a true bulb. The 
nerve ring, which is distinet and rather thick, is situated at about 
the middle of the æsophagus. As far as I have been able to as- 
certain there are seen at the level of the buccal cavity in the 
outer layer of the æsophagus itself some chitinous differentiations 
presenting themselves as rodlike features. The are plainly seen in 
the figure 0. As far as I am aware something like this is hitherto 
unique among freeliving Nematodes. 
The ventral giand is lengthened and situated along the side of 
the intestine a considerable distance behind the base of the æso¬ 
phagus. I have the impression that it is of considerable size but 
as it is rather indistinet I am not sure that I have succeeded in 
observing its limits. Its efferent apparatus is of particular interest; 
as usual in freeliving Nematodes the duet is of protoplasmatic 
structure and is a part of the secernating cell itself; it is of con¬ 
siderable width and ends with a large ampulla which is of the 
same structure as the duet. From this ampulla issues an exceed- 
ingly long efferent tube of chitinous structure and opening in the 
very front end on the ventral side of the ventral lip, cephalad to 
the cephalic bristles. This feature is, as far as I am aware, quite 
unique among freeliving Nematodes. The length of the tube makes 
in the fullgrown female of 3 ,2 mm 48 fi; only a small part of the 
ampulla is formed by the tube and consequently this part is chit¬ 
inous. 
I shall here remark that, concerning a uniform nomenclature, 
I call the protoplasmatic part of the efferent apparatus, „efferent 
duet" and the chitinous part, originating from a cuticular invagin- 
ation „efferent tube“ as I did in my last papers dealing with free¬ 
living Nematodes. It will, I think, be convenient to keep distinet 
these two designations. 
The female organ is single. The vulva is situated a consider¬ 
able distance behind the middle; the antevaginal part of the body 
is in proportion to the postvaginal part as about 3 to 1. No va¬ 
ginal giands have been observed. In the uterus are found eight 
shell-eggs of the usual ovoid shape. The spicules are rather straight 
