392 
Digenetic Trematodes in Japan 
Recently Rodenwaldt 1 has described a new species, Fasciolopsisfuelleborni. 
I have reason to believe that this is F. bushi. F. fuelleborni is distinguished 
from Odhner’s F. busJci principally by the absence of the caecal sac of the 
vesicula seminalis. He may have mistaken the caecal sac for the cirrus-pouch. 
Should his observations be correct, F. fuelleborni would rather belong to some 
genus other than Fasciolopsis. F. rathouisi Poirier 2 , and F. yoddardi Ward 3 
may not be good species. 
(8) Paragonimus westermani (Herbert). 
This species is parasitic in the lung or the viscera of man, the dog, the 
cat, the tiger and the pig. I have dealt with the structure and the life-history 
of this species in other communications 4 . 
(9) Fischoederius elongatus (Poirier), and Paramphistomum sp. 
These two species are found very frequently and numerously in the first 
and second stomachs of Bos taurus. It is certain that there are several species 
of Paramphistomidae in Japanese cattle; they need further investigation. 
(10) Watsonius macaci n. sp. 5 
Diagnosis. Size 11-3 mm. x 6*5 mm. Oral sucker small, 0-75 mm. in 
length. Posterior sucker (acetabulum) very large, 2 mm. in diameter. In the 
caecum of Macacus cynomolgus. 
Description. The following description is based on some ten specimens 
collected from the caecum of Macacus cynomolgus. 
Body flattened; broadest part at the level of the posterior fifth of the 
body; posterior end rounded; anteriorly the body narrows, the narrowing 
becoming abrupt at the anterior sixth of the body-length. Dorsal and ventral 
surfaces are slightly convex. Specimens fixed by heat are 11*3 mm. in length, 
6-5 mm. in breadth, and 2 mm. in thickness; specimens fixed with sublimate 
are 2-3 mm. shorter than those killed by heat. Posterior sucker lies at 
posterior extremity of body; round in contour, margin elevated; diameter 
2 mm. Oral sucker lies at the anterior body extremity; its anterior half 
cylindrical, its cross section being ring-like; posteriorly it flattens and shows 
a crescent shape in transverse section; its size is 0*015 mm. x 0*45 mm. 
Postero-laterally a pair of spherical suctorial pouches are present, 0-4-0-5 mm. 
in diameter. 
1 Rodenwaldt, E. (1909). Fasciolopsis fulleborni n. sp. Centralbl. f. Bakteriol., etc. l. 
2 Poirier, S. (1887). Note sur une nouvelle espece de Distome, parasite de l’homme, le 
Distomum Rathouisi. Arch. zool. exper. et gen. (2), v. 
3 Ward, H. B. (1909). Fasciolopsis buslcii, F. rathouisi and related species in China. Stud. 
Zool. lab. Univ. Nebraska, No. 94. 
4 Kobayashi, H. (1918). Studies on the lung-fluke in Korea. 1: On the life-history and 
morphology of the lung-fluke. Mitt. Med. Hochsch. n. (1919), 2: Structure of the adult worm. 
Ibid. iv. 
5 It is very probable that this species is identical with Watsonius watsoni collected by Joyeux 
from Cercophithecus callitrichus (A. Railliet, etc. Bull. Soc. Path. exot. v ). 
