OPISTHORCHIS WARDI, A NEW SPECIES OF LIVER 
FLUKE FROM THE CAT IN THE PHILIPPINE ISLANDS 
By Lawrence D. Wharton 
Dean and Professor of Zoology, Junior College of Liberal Arts, University 
of the Philippines, Cebu 
ONE PLATE 
In making postmortem examinations of cats for parasites at 
the College of Medicine and Surgery in Manila, the bile ducts 
of nearly 50 per cent of the specimens examined have been found 
to be infested with a species of Opisthorchis . The first speci- 
mens obtained were thought to be Opisthorchis felineus (Rivolta, 
1884), and I sent a mounted specimen to Dr. H. B. Ward under 
that name. He very kindly sent me drawings of the type speci- 
mens of 0 . felineus and O. pseudo-felineus and pointed out 
several differences between my specimen and the other two 
forms mentioned. Since that time I have collected a large series 
of specimens from over twenty cats, all from Manila, and it was 
found that the characters which Doctor Ward had mentioned 
are constant and of sufficient importance to justify considering 
this form a distinct species. I therefore propose the name Opis- 
thorchis wardi for this species. 
Opisthorchis wardi sp. nov. Plate 1, fig. 2. 
Specific diagnosis. — Body elongated, transparent, flat; length 
in preserved specimens, 6 to 9 millimeters; breadth, 1.6 to 2.2; 
living specimens, somewhat larger; anterior end conical, with a 
slight constriction at the level of the ventral sucker, posterior 
end rounded, occasionally with a small projection around the 
excretory pore; oral sucker 0.17 to 0.28 millimeter in diameter; 
ventral sucker about the same size and about one-fourth of the 
length of the body from the anterior end; pharynx 112 to 174 
p, in diameter; oesophagus two to three times as long as the 
pharynx ; intestinal caecas reach almost to the posterior end of the 
body ; excretory pore at the posterior border ; excretory bladder 
narrow, and extending to in front of the testes; testes in pos- 
terior fourth of the body, deeply lobed, anterior with four lobes, 
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