348 THE INDIAN JOURNAL OF VETERINARY SCIENCE AND ANIMAL HUSBANDRY [VI, IV

behind the latter, it is transversely striated (Plate XXII, Fig. 1) throughout the
body. For a greater length of the anterior part of the body, the posterior
edges of the striae are directed posteriorly in the form of spines, but towards
the posterior extremity the striae become inconspicuous and their posterior edges
smooth. Lateral alae are present.

The terminal mouth leads into a tubular oesophagus (Plate XXII, Fig. 1)
which measures about from 124 to 180 microns from the mouth opening in both
the sexes. The nerve ring (Plate XXII, Fig. 1) in both the sexes is situated at
a distance of 72 microns from the mouth opening. Cloacal opening is distinct
in the male, (Plate XXII, Fig. 2) but it appears to be absent in the female.

The male worm.—The male parasite is 3 to 4.5 millimeters* long and 108 to
126 microns wide. The caudal extremity (Plate XXII, Fig. 2) is attenuated and
slightly bent towards its ventral aspect. The alimentary tract widens out
towards the posterior limit of the oesophagus in the form of a straight tube
which constitutes the intestines. The intestinal tube ends in a minute anus
opening into a cloaca which also receives the structures of the male genitalia
The latter consists of a single tubular testis, and two unequal spicules. The
testis begins about the anterior fifth of the body, and runs parallel to the
intestine. It is a compact structure consisting of cells which give rise to
spermatozoa. Of the two spicules (Plate XXII, Fig. 2) the left one is the larger and
measures about 150 to 180 microns in length. The right spicule being the smaller
of the two measures about 43 microns. Near the smaller spicule and dorsal to it
lies the small gubernaculum. The cloacal opening is situated at about 25 to 30
microns from the posterior extremity. There are two pairs of post-anal
papillae (Plate XXII, Fig. 2).

The female worm—The female parasite is stouter and longer than the male.
It measures from 7 to 9.5 millimeters in length, and from 190 to 208 microns in
width. The caudal extremity of the female is broader than the oral extremity,
(Plate XXII, Fig. 1, and Plate XXIII, Fig. 3) and is straight and stumpy. As in
the male, the intestine begins from the posterior limit of the oesophagus as a
straight tube like structure. For a certain distance in the anterior half of the
worm, the intestine runs parallel to the vagina and the uteri, (Plate XXII, Fig. 1)
but posteriorly (Plate XXIII, Fig. 3) it becomes indistinct in the loops of the
uteri and the ovaries. No distinct anus has been observed. The vulva (Plate
XXII, Fig. 1) which is a sack like structure measures about 72 microns in length,
and opens out in the form of a spout at a distance of 75 to 90 microns from the
mouth opening. Behind the vulva is the vagina which is a straight tubular organ
measuring from 252 to 288 microns in length. Behind the vagina begin the two

* Except for the length of the worms which is given in millimeters, all
other measurements are in microns.