H. Kobayasiii 391 
2. Radical differences are manifested in the structure of the cirrus-pouch 
and the vesicula seminalis. 
3. The ventral sucker of Fasciolopsis has a peculiar bulging on the 
posterior wall, while Fasciola has none. 
4. The oral sucker of this species has a peculiar prepharyngeal sphincter 
which is wanting in Fasciola. 
5. In the parenchyma of Fasciolopsis numerous well-developed, longi¬ 
tudinal parenchyma muscles are present, while in Fasciola they are wanting. 
6. Fasciola has branched intestines, contrary to Fasciolopsis. 
7. Remarkable differences are presented in the excretory vesicle of 
Fasciolopsis. 
These and other characteristics show that Fasciolopsis has affinity with 
the Echinostomidae, and even mav be considered as an aberrant form of the 
Echinostomidae. 
Consequently, the generic and specific diagnosis of this parasite should be 
thus modified. 
Fasciolopsis Lss., emend. 
Diagnosis. Echinostomidae. Body large, flat. Cuticle with scale-like 
spines. Without well-developed, spinose head collar. Oral sucker with 
peculiar sphincter muscles along its posterior margin. Excretory vesicle with 
peripheral network. With long cirrus-pouch, which reaches far behind the 
ventral sucker. Testes lying one behind the other and terminally branched, 
likewise the ovary. Vesicula seminalis with spiral wall and a peculiar blind 
sac. Vitellaria well developed. Uterus relatively long, with several loops. 
Parasitic in the intestine of mammals. 
Type species: F. busJci (Lank.). 
Fasciolopsis busJci (Lank.), emend. 
Diagnosis. Size 24-27 mm. x 5*5-12 mm. Cuticle with spines, more 
numerous on the ventral body surface. Oral sucker small. A entral sucker 
much larger than the oral, with peculiar posterior cup-like evagination. 
Longitudinal parenchyma muscles remarkably well developed. Intestinal 
caeca take a somewhat winding course. Excretory vesicle with a median 
stem and numerous lateral branches, subcutaneous network, and a large 
lacuna between the two suckers. Cirrus-pouch is canal-like and extends 
about one-fourth of the body-length. The greater part of the vesicula seminalis 
lies posterior to the ventral sucker. Cirrus with fine spines projecting in the 
lumen. Testes lie in the posterior half of the body. Ovary lies directly in 
front of the anterior testes, slightly right to the median line. Vitellaria extend 
from the ventral sucker to the posterior end of the body. Eggs large, elliptical 
with thin shell, 0*12-0*13 mm. x 0*07-0*08 mm. Parasitic in the intestine of 
man and pig. 
