394 
Digenetic Tremcitodes in Japan 
III. REPTILIAN AND AMPHIBIAN TREMATODES. 
(12) Polyangium miyajimai n. sp. (PI. XXV, fig. 4). 
Diagnosis. Size 10-11 mm. x 2 mm. Oral sucker round, 0-3 mm. in 
diameter. Intestinal caeca with sinuate wall. Xo trace of pharyngeal bulb. 
Eggs 0-07 mm. x 0-04 mm. Habitat: in the intestine of Chelone midas. 
Description. This species was found infesting the intestine of Chelone 
midas at Singapore in 1914. The parasite was collected by M. Miyajima, 
M. Koidzumi and R. Takano. The specimens were fixed by heat. 
The size of a mature specimen is 10-11 mm. x 2 mm. The lateral margins 
of the body are almost parallel, but posteriorly the body slightly narrows. 
The posterior end is pointed while the anterior end is rounded. The cuticle 
is beset with fine, closely set processes, but they are often insignificant. The 
oral sucker has a round outline, the diameter being 0*3 mm. The oesophagus 
is narrow, the length being 2 mm. There is no trace of the muscular thickening 
in the posterior part of the oesophagus. The intestinal caeca are broad and 
simple and run straight along the lateral margin of the body and terminate 
near the posterior end. 
The excretory pore lies medianally on the dorsal side near the posterior 
end of the body. The unpaired part of the vesicle runs directly almost to the 
posterior part of the ovary. 
The testes lie 0-2 mm. apart, one behind the other, in the space between 
the intestinal caeca, the hindermost being situated 2 mm. from the posterior 
end of the body. They have a round shape, their diameter is 0-8 mm. and they 
are directly attached laterally to the intestine, the latter often bending 
exteriorly at the point of attachment. The vesicula seminalis is long and runs 
in the median plane, slightly bending laterally. Anteriorly the vesicula 
seminalis reaches the level of the bifurcation of the oesophagus, where it 
joins the pars prostatica. The pars prostatica is a straight canal, lying in the 
median line, near the ventral surface. 
The ovary lies directly behind the posterior testis, slightly to the right of 
the median line. The outline of the ovary is somewhat round; the diameter 
being 0-3 mm. Posterior to the ovary lies the compact mass of the shell- 
gland. The vitellaria occupy the posterior three-fifths of the body, lying 
mostly outside the intestinal caeca; a small part, however, is found inside 
the intestinal caeca posterior to the ovary. The uterus, with relatively few 
loops, lies between the intestinal caeca. Anteriorly the uterus runs straight 
along beneath the pars prostatica and the oesophagus, and opens to the 
exterior through a short vagina. 
The genital opening lies in the ventral median line, 0-5 mm. from the anterior 
end of the body. 
The egg has a size of 0*07 mm. x 0-04 mm., with relatively thick wall and 
a distinct lid. The mature shell-wall is brown in colour. 
