31 
The European Cat Fluke — OPISTHORCHIS FELINEUS« (Rivolta, 1884) 
Blanchard 1895 — of Cats, Dogs, Man, etc. 
[Figs. 42 to 44.] 
Specific diagnosis. — Ojnsfhorchis: 8 to 13 111111 ., seldom 18 111111 . long, 1.25 to 2.5 
mm. broad; flat, lanceolate, anterior end 
conical, jiosterior end rounded; the ante- 
rior fifth of the body more or less con- 
stricted from the posterior four-fifths; red- 
dish, transparent. Oral sucker and ven- 
tral acetabulum of same size, 0.28 mm. in 
diameter; oral sucker terminal to subter- 
minal; ventral sucker at plane of constric- 
tion between anterior fifth and posterior 
four-fifths of body. Skin without spines. 
Pharynx small, 0.204 mm. long, 0.161 
mm. broad, follows the oral sucker; esoph- 
agus 0.2 mm. long; intestinal ceca extend 
to posterior end of body. Male organs: 
Testicles lobate. Female organs: Uterus 
moderately well developed; ovary slightly 
lobate; shell gland diffuse, composed of 
unicellular glands; receptaculum ‘ seminis 
postero-lateral of ovary; vitellaria lateral 
in equatorial third of body, and com- 
posed of seven to nine groups of acini 
on each side; transverse vitelloduct runs 
postero-median. Fggs oval, 26 to 30 by 
11 to 15 //, with sharply defined operculum 
on the more acute pole; contain ciliated 
embryo at oviposition. Bporocyst, redia, 
cercaria,' and intermediate host undeter- 
mined. 
Habitat. — Gall ducts of the domesticated 
cat {Fehs'Catus dornestica), domesticated dog 
{Canis familiaris), glutton {Gido borealis), 
and man {Homo sapiens). 
Geographic distribution. — Europe (Ger- 
many, Holland, Italy, Fiance, and Russia). Fig. 42 . — Rivolta’s ( 1884 ) original figure of 
Opisthorchis felineus: an., acetabulum; 
« Synonyms. — Distoma conus Gurlt, 1831 rx.p., excretory pore; r/. p., genital pore; 
(not Creplin, 1825) ; Distoma lanceolatum^^ ^’^t^stinal ceca; m., mouth; p. h., phar- 
£ o- n 1 1 100c / £ rr -77 7 . yngeal bulb; h, testicles; uterus; d., 
of von Siebold, 1836 (not Fasaola lanceolala deferens; v. rj„ vitellogene gland. 
Schrank, 1790); “ Distomum lanceolatum 
Mehlis” of Uiesing, 1850 (sub D. truncatum) ; Distomum felineum Rivolta, 1884; 
'' Distomum conus^’ of Sonsino, 1889 (sub D. truncatum); Distomum sibiricum'Wuio- 
gradoff, 1902: Distomum {Dicroccelium) felineum Rivolta of Braun, 1893; Distoma 
{Dicrocceliurn) felineum Rivolta of Stiles, 1894 (sub D. truncatum); Opisthorchis 
felineus (Rivolta, 1894) R. Blanchard, 1895; Opisthorchic felineus (Rivolta) Stiles, 
1901 (misprint). 
Bibliography. — Stiles & Hassall, 1894, pj>. 426-427. 
