36 
'S'itellaria moderately developed, occupying about the equatorial third of the lx)dy. 
Eggs oval, 27 to 30 // by 15 to 17 /^; dark brown, with sharply defined operculum; 
contain cihated embr\m at oviposition. Sporocyst, redia, circaria, and intermediate 
host undetermined. 
Figs. 51-58. — Eggs of Opisthorchis sinensis in different stages of development, as found in the uterus. 
Vote the operculum at one end. Greatly enlarged. (After Katsurada, 1900, pi. 13. figs. 2-9.) 
Habitat. — Gall ducts, pancreatic ducts, duodenum, and stomach of man {Romo 
sapiens) and cats {Fells catus domestica). 
Geographic distributiov. — Asia; sporadic imported cases elsewhere. 
Several imported cases of this parasite have been found in the 
United States and Canada. In some of the Japanese cases that have 
Figs. 59-60. — Free embryos (miracidia) of same. Greatly enlarged. (After Katsurada, 1900, pi. 13, 
figs. 10-11.) 
been recorded several thousand parasites have been present, and while 
the hepatic ducts are more frequently affected, some cases are recorded 
of the presence of this fluke in the pancreatic ducts, in the duodenum, 
and in the stomach. See p. 8. 
