35 
The Asiatic Liver Fluke— OPISTHORCHIS SINENSIS « (Cobbold, 1875) 
Blanchard, 1895 — of Man. 
[Figs. 49 to 62.] 
Specific diagnosis. — 
Ojnsthorcitis: 10 to 20 mm. 
long, 2 to 5 mm. broad; 
flat, lanceolate to oblong 
oval, attenuate anteriorly, 
rounded posteriorly; red- 
dish, nearly transparent 
during life. Oral sucker 
larger than ventral ace- 
tabulum, vhich is about 
on border between first 
and second fourths of 
body. Skin without 
spines. Pharynx globular, 
about 0.22 mm. in diame- 
ter; esophagus 0.17 mm. 
long, not longer than 
pharynx; bifurcation of 
intestine nearer to oral 
to acetabulum; intestinal 
extending to posterior end 
of body. Male organs: Testicles in pos- 
terior third of body, branched, usually 
extending beyond intestinal ceca into 
the lateral fields and situated ventrally 
of the sigmoid excretory canal. Female 
organs: Uterus moderately developed; 
ovary trilobate; immediately anterior of 
the large elongate vesicula seminalis; 
Synonyms. — Distoma sinense Cobbold, 
1875; Distoma sineuse of McConnell, 1876 
(misprint) ; Distoiimm spatlmlatum Leuck- 
art, 1876 (not Creplin, 1849; for spatula- 
tum Rudolphi, 1819); Distomum sj^atula- 
tiun Cobbold, 1879 (not Eudolphi, 1819); 
Distoma hepatis endemicum Baelz, 1883; 
Distoma liejmtis innocuum Baelz, 1883; 
Distoma hepatis perniciosum Baelz, 1883; 
Distoma spatulatuni (Cobbold, 1879) 
Blanchard, 1888; Distoma japonicum E. 
Blanchard, I88601T888; Distommn sinense 
(Cobbold) Leuckart, 1889; Opisthorchis 
sinensis (Cobbold, 1875) E. Blanchard, 
1895; Dicrocodium sinense (Cobbold) Mo- 
niez, 1896. 
Bibliography. — For technical zoo- 
logical discussion, see Leuckart (1889, 
pp. 336 to 355, tigs. 154 lo 161); for 
medical discussion, with record of 76 
autopsies, see Katsurada (1900, pp. 479- 
504). White (1902, p. 523) has found 
18 cases in San Francisco. 
Fig. 49. — The 
Asiatic liver 
fluke {Opi s- 
thorchis sinen- 
sis). Natural 
size, from 
specimen 
(U.S.P.H. A 
M.H.S. No. 
9410) collect- 
ed in S a n 
Francisco by 
Asst. Surg. M. 
J. W h i t e. 
Original. 
sucker than 
ceca slender. 
V. 
Fig. 50.— The same, ventral view, greatly enlarged 
to show the anatomy; ac., acetabulum; ex. c., ex- 
cretory canal; ex. p., excretory pore; g. p., genital 
pore; i., intestinal ceca; L. c., Laurer’s canal; ?n., 
mouth, with oral sucker; or., ovary; p. h., pharju- 
geal bulb; s. g., shell gland; t., testicles; id., uterus; 
V. d.. vas deferens; r. g., vitellogeue glands; v. s., 
vesicula seminalis; v. t., vitelloduct. Original. 
