26 
in the preceding species of this genus — 
cyathiform heeps of pigment and seem to 
have contained a lens. They are situated 
160 p behind the front end, measured on a 
female of 21,8 mm. In a male of 18,7 mm 
the same distance makes 152 p. The lateral 
organs are perhaps somewhat more length- 
ened than in T. campbelli. The longitudinal 
axis makes c. 12 p, the transverse axis 
makes c. 7 p. The oesophagus is rather long; 
it is of about equal width in its foremost 
half whereafter it increases evenly towards 
its base. The nerve ring, which is very dis¬ 
tinet, is situated somewhat more cephalad 
than in the T. campbelli, at the level of about the first fourth of 
the length of the oesophagus. 
The vulva is situated a considerable distance caudad to the 
middle of the body. In a female, the length of which makes 21,8 
mm, the place of the vulva is 14,s mm behind the front end. The 
dilatator muscles are highly developed and rather large, piriform 
giands, consisting of a single cell each, open into the vulva. A feat¬ 
ure characteristic of this species is the large number of eggs, seen 
in the uterus. In one of the largest females I count no less than 
43 shell-eggs, a fertility very seldom seen in freeliving Nematodes. 
The hind-part of the body of the male is ineurved, as usual in 
this genus. In front of the ano-genital aperture the papilliform sup- 
plementary organ is seen. The structure of this is seen in fig. 8, 
PI. III. There is a chitinized opening for the glandular secretion. I have 
not succeeded in observing the giand itself, but according to Jager- 
ski 6 ld, it is lying very deep in the tissue, only perceivable on 
sections. The distance of this papilla from the ano-genital opening 
is c. 112 p. There are only two bursal papillæ on each side in 
this species. They are situated a considerable distance cephalad to 
the supplementary organ; the hindmost one thus is found c. 224 p 
in front of the ano-genital aperture, and the distance between the two 
papillæ makes c. 160 p. Some distance cephalad to these papillæ 
a square part of the ventral side of the cuticle is found covered 
with very dense papillæ the shape of which is conical and with 
Fig. 18. Thoracostoma papil- 
losum ; male papillæ. 
