374          Amphistomatous Parasites of Indian Food-Fishes

A small cirrus sac containing vesicula seminalis interna, pars prostatica and
ductus ejaculatorious is present. The vesicula seminalis externa is fairly long
and coiled. The spherical ovary of 0.24 in diameter is situated slightly to the
left of the median line in the intercaecal space at the beginning of the last
quarter of the body length. A small, diffuse shell gland mass lies behind and
partly overlapping the ovary. Uterus as in type species and contains several
eggs of 0.114—0.12 × 0.072—0.076 in size. Vitellaria are follicular, extend-
ing laterally from the anterior level of the acetabulum to the posterior level of
the oesophageal bulb. They partly overlap the caeca. The excretory and the
lymphatic systems are as in the type species.

Orientodiscus jumnai, n. sp. resembles the type species in most of its
characters. The only important difference is the unlobed character of the
gonads which is a constant feature both in mature and immature forms.

The author is deeply grateful to the Director and the Pathologist of
the Imperial Veterinary Research Institute, Mukteswar-Kumaun for kind
encouragement.

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