curved towards ventral surface. Cuticle smo- 
oth. Lateral lines 0,238 mm. wide, at level of 
oesophagus. Head rounded, without lips, 
with small cephalic alae. Mouth formed by 
a funnel-shaped shallow groove, at the anteri- 
or extremity of oesophagus, surrounded by 
narrow border of cuticle. This rim is thicker 
in the ventral than in the dorsal segment; 
the anterior end of the oesophagus is more 
prominent in the ventral than in the dorsal 
part, so that the transversal plane of the 
mouth is bent towards the dorsal surface. 
Oesophagus club-shaped, with dark pigmen- 
tation behind the nerve collar, has no bulb, 
and is 0,47 mm. to 0,85 mm. long. Nerve 
collar 0,31 to 0,42 mm. from cephalic end. 
Lateral expansions all the way down the body 
from head to near anus; transversal section 
of same like right-angle triangle; the grea- 
test width 0,048 to 0,066 mm.; at the height 
of the posterior part of oesophagus. At the 
distance of 0,56 mm, from the head, is a 
narrow belt of protoplasm beginning at the 
lateral line, traversing the corresponding la- 
teral ala to its edge; this is doubtless a sen- 
sitive Organ, 
Male: Tail measuring 0,44 mm, with cur- 
ved dorsum ending in a caudal appendix, 
0,073 mm. Genital bursa well developed, fur- 
nished with 24 papillae, disposed in five series: 
two sub-lateral, two sub-ventral at the level | 
of the caudal expansions, one in inthe space 
between the two expansions. The sub-lateral 
rows are formed by three post-anal papillae: 
one at the posterior limit of the first sub- 
ventral papillae (the papillae are counted be- 
ginning at the caudal extremity), one near the 
second sub-ventral, one in the space betwen 
the second and third sub-ventral ones. The 
sub-ventral series consist of eight papillae: 
three post-anal, one ad-anal, and four pre- 
anal; of the post-anal the first very volumi- 
nous, near the posterior extremity, the second 
smaller, just above the afore-mentioned one, 
the third small just below the anus; the pre- 
anal: one above the anal orifice, one between 
the anus and the sucker, the fourth 0,14 mm. 
above the sucker. The median series consists 
of two papillae: one just above the anus, the 
35 
other at the end of the lower canal. Sucker 
without chitinous rim, slightly prominent 0,45 
mm. from caudal extremity. Spikes two, slight- 
ly chitinized, curved like the latter, without ac- 
cessory piece, 0,765 mm. long. Anus 0,17 to 
0,18 from posterior extremity. 
Female: Tail conical and sharp-pointed. 
Vulva cleft-like, occupying 1/3 of total cir- 
cumference, situated at the junction of the 
middle third of body with posterior. Anus 
0,22 to 0,25 inm. from caudal extremity. Eggs 
0,051 to 0,062 min. long, ano 0,037 mm wide. 
Habitat: intestine of Macrones aor. Ham 
Buch. 
Geographical distribution: Asia (India). 
30. Subulura pigmentata Gedoelst, 1917. 
Dimensions: 
3 Length: 16,5—18,6 mm.: width: 640 
to 750 micra. 
Q Length: 27—27,6 mm.; 
mm. 
Body whitish, cylindrical, more slender at 
extremities: cephalic extremity obtuse, round : 
caudal extremity conical, sharp. Teguments 
striated transversally, striations 3,3 to 4 micra 
distant from one another; Cephalic alae be- 
ginning a little behind the head, stretching to 
the posterior part of the oesophagus, which 
measures 1,35 to 1,9 mm. and is from 50 
to 90 micra wide; the striations are trans- 
versal. 
Mouth terminal, hexagonal, with great 
dorso-ventral diameter, contained by an on- 
dulated border, individualising 6 small pro- 
minent lips, arranged by threes on eachside 
of the great diameter; furnished with 6 well 
developed papillae ; followed by buccal cavity 
or vestibulum, slenderer in the anterior part 
and larger in the posterior part enclosing 
the tridentate apparatus characteristic ofthe 
Subulurae. The oesophagus may be divided 
into two parts; the first larger slightly di- 
lated part gets narrower at the amterior 1/4 
or 1/5 and then widens into club-shape; the 
second part is separated from the first bya 
constriction, constituting the sub-globulous 
oesophagean bulb, containing the teeth. Nerve 
collar at the height of 1/4 or 1/5 anterior part 
width; 0,7 
