.31 
The European Cat Fluke— OPISTHORCHIS FELINEUS^' (Rivolta, 1884) 
Blanchard 1895 — of Cats, Dogs, Man, etc. 
[Figs. 42 to 44.] 
Specific diagnosis. — Opisthorchis: 8 to 13 mm., seldom 18 mm. long, 1.25 to 2.5 
mm. broad; fiat, lanceolate, anterior end 
conical, iiosterior 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, folloM^s 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 p by 
11 to 15 //, with sharply defined operculum 
on the more acute pole; contain ciliated 
embryo at oviposition. Sporocyst, redia, 
cercaria, and intermediate host undeter- 
mined. 
Habitat. — Gall ducts of the domesticated 
cat {Felts catus dotnestica), domesticated dog 
{Cams familiaris), glutton {Gulo borealis), 
and man {Homo sapiens). 
Geographic distribution. — Europe (Ger- 
many, Holland, Italy, Fiance, and Russia). 42 , — Rivolta’s (1884) original figure of 
^ Opisthorchis felineus : ac ., acetabulum; 
« Synonyms. — Distoma conus Gurlt, 1831 car.p., excretory pore; r;. r., genital pore; 
(not Creplin, 1825) ; ‘ ‘ Distoma lanceolatunC^ intestinal ceca; m., mouth; p. b., phar- 
p c- -U 1 1 icon f -r • 1 1 7 . yngeal bulb; f., testicles; uterus; v. d., 
of von Siebold, 1836 (not Fasciola lanceolata deferens; r. vitellogene gland. 
Schrank, 1790); “ Distomum lanceolatum 
Mehlis” of Hiesing, 1850 (sub D. truncatum) ; Distomum felineum Rivolta, 1884; 
"‘Distomum conus'' of Sonsino, 1889 (sub D. trunccdum) ; Distomum sihiricumWino- 
gradoff, 1902: Distomum {Dicroccelium) felineum Rivolta of Braun, 1893; Distoma. 
{Dicrocoelium) 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, pp. 426-427. 
