396 
Digenetic Trematodes in Japan , 
about 0*12 mm. The appendages develop with the growth of the egg-shell, 
young eggs showing small protuberances only. 
(14) Octangium takanoi n. sp. (PI. XXV, fig. 5). 
Diagnosis. Size 5*5 mm. x 1*2 mm. in largest specimens. Oral sucker 
somewhat ellipsoidal. Vitellaria extend posteriorly from level of anterior 
testis. Eggs 0-07-0-075 mm. x 0-045 mm. Habitat: in the intestine of Chelone 
midas. 
Description. This species was found in the intestine of Chelone midas , 
captured at Singapore in 1914. The specimens were collected by M. Miyajima 
and others and fixed by heat. 
Body elongate, breadth uniform in main part of the body, slightly narrow¬ 
ing anteriorly and posteriorly. The general appearance resembles that of 
Octangium hasta Looss. The size of the largest specimens is 5-6 mm. x 1-2 mm. 
The oral sucker is somewhat elongated. The oesophageal lumen is wide and 
its thickening is very remarkable. The bifurcation of the intestine lies at the 
anterior third. The intestinal caeca are almost straight. The anterior ends of 
the vitellaria are situated at the level of the anterior margin of the testes, 
not attaining the level of the oesophageal bifurcation. The egg is decidedlv 
smaller than in other species of the genus, measuring 0-07-0-075 mm. 
x 0-045 mm. 
(15) Pneumonoeces sp. 
This species, of which I have examined a few specimens only, was found 
in the lung of Rana nigromaculata collected in Tokyo. The cuticle is armed 
with spines. 
(16) Loxogenes liberum Seno. 
I found many examples of this species in the duodenum of Rana nigro¬ 
maculata collected in Tokyo, etc. 
* 
IV. FISH TREMATODES. 
(17) Leptolecithum eurytremum n. g., n. sp. (PL XXVI, fig. 1). 
Leptolecithum n. g. 
Diagnosis. Hemiuridae. Body moderately large, flat; widest at posterior 
third. Both suckers well developed; ventral sucker at anterior third of body 
length. Glandular stomach well developed; intestinal caeca with several 
lateral windings and terminating blindly near the posterior end. Stem of 
the excretory vesicle bifurcates near the middle of the body and both arms 
extend almost to the pharynx; stem and arms both make several lateral 
windings. Testes lie symmetrically, immediately posterior to the ventral 
sucker. \ esicula seminalis a convoluted canal lying anterior to the ventral 
sucker. Ovary vermicular in form, lying transversely near the posterior end 
