C. L. Boulenger 
435 
of the mouth-collar, this basal region bears in addition a second 
appendage in the form of a delicate trumpet-shaped process directed 
externally (Plate XXII, fig. 3, Sm.P.). 
The mouth capsule is goblet-shaped, it attains its greatest width of 
0-32-0-47/x near its anterior margin and narrows considerably posteriorly. 
Its length varies from 0-22-0-32 p,. The wall of the capsule is compara¬ 
tively thin except posteriorly where it is greatly thickened in such a 
manner as to form a hoop-like transverse ridge encircling the base of 
the mouth capsule, an exaggeration of the conditions prevailing in 
some of the larger species of Cylichnostomum, e.g. C. elongatum ( cf . Plate 
XXII, fig. 3, M.C.). There is no dorsal gutter, the dorsal oesophageal 
gland opening at the base of the capsule. 
The oesophagus has a length of 1-3-1-7 mm., it is broadest anteriorly, 
just behind the mouth capsule, and narrows somewhat towards the 
middle, increasing again in width posteriorly. The oesophageal funnel 
is well developed and the lining of its triradiate cavity is modified 
to form three tooth-like structures, which do not however protrude 
into the mouth capsule; the general structure of the funnel can 
be considered as an exaggeration of that met with in some species of 
Cylichnostomum, e.g. C. elongatum (Looss 1901, p. 129). The excretory 
pore (Plate XXII, fig. 2) and the cervical papillae occupy a position 
slightly posterior to the nerve-collar, about 1-2 mm. from the anterior 
end. The cervical papillae are extremely small and difficult to see. 
Females : 19-22 mm. in length with a maximum thickness of 
1-1-1-5 mm. in the middle of the body; this thickness is maintained 
behind the middle until the level of the vulva which is situated 2-8- 
3-7 mm. from the posterior extremity; behind this point the body 
tapers rapidly to the end forming a pointed tail region (Plate XXII, 
fig. 4). The anus lies 05-07 mm. from the posterior end. The extremity 
of the tail has a rather variable shape according to the degree of 
contraction, it frequently appears mucronate as described by Giles. 
The female genital organs are arranged on the plan common to all 
the Cylicostomeae, that is to say the two uteri are parallel. 
The eggs are large, oval and thin-shelled, they measure 100-130 p 
in length by 50-60p in breadth. They are laid in the early morula 
stage (Plate XXII, fig. 7). 
Males: 15-16 mm. in length, the body is thickest (0-95-1 mm.) 
in the middle decreasing slowly towards the bursa and measuring 
0-45-0’5 mm. in width at the base of that organ. 
The bursa has a breadth of 0-9 to 1 mm., as described by Giles it is 
