402 
Digenetic Trematodes in Japan 
glands which protrude into the lumen and lie closely side by side. This pheno¬ 
menon primary epithelial cells being degenerated and secondary wall formed 
b y union of the ducts of the prostate glands—seem to show the processes of 
formation and the nature of the cuticula of the body surface and other parts 
in like manner. 
The ovary lies near the posterior end of the body. It is 1 mm. in width 
and has numerous lobes, florsallv to the ovary the mass of the vitellanum 
lies, it is somewhat larger than the ovary and is divided into several lobules. 
Laurer’s canal ends in a vesicular cell mass, similar to that of Leciihochirium sp. 
described later. The uterus is a broad canal which first runs near the ventral 
body surface, and later near the dorsal, with many windings. Near the anterior 
doisal part of the ventral sucker it is continued into the vagina which unites 
with the ductus ejaculatorius and forms a canal-like genital sinus. The genital 
pore opens near the oral sucker. 
The eggs are numerous, spherical in form, and 0-015 mm. in diameter. 
the parasite was found in the stomach of Muraenesox cinereus, captured 
near Okayama (1914). 
(20) Lecithochirium sp. (PI. XXVI, fig. 2). 
This species infests the stomach of Muraenesox cinereus. The length of 
the body proper is about 3-5 mm. and the appendix 2 mm. The breadth is 
1 mm., being broadest m the posterior part of the body proper. The ventral 
sucker lies 1-1-5 mm. from the anterior end. The diameters of the oral and 
the ventral sucker are 0-4 mm. and 1-6—1-9 mm. respectively. The size of the 
egg is 0-021 mm. x 0-01 mm. 
This species seems to be new to science 1 . 
(21) Brachyphallus sp. 
This species infests the stomach of Scomber japonicus. The size of the 
body is 1-1-7 mm. x 0-35 mm. The diameters of the oral sucker and the ventral 
sucker are about the same, being 0*12 mm. The pharynx has a diameter of 
0-065 mm. The egg is 0-024 mm. x 0-012 mm. 
(22) Lecithocladium sp. 
ihis species infests the stomach of Scomber japonicus. The body-length is 
6-5-7-S mm. The oral and the ventral suckers have lengths 0-45-0-5 mm. and 
In the description of this and other genera, Juel, H. 0. (1889), Beitrage zur Anatomie der 
Trematodengattung Apoblema (Dujard.), Bill. Till. K. Svenska Vet.-AJcad. Handl. xv. afd. iv. 
No. 16; Lander (1904), The Anatomy of Hemiurus crenatus, etc. (Bull. Mus. Comp. Zool. Harvard, 
xlv.), and Looss (1908), Beitrage zur Systematik der Distomen. Zur Kenntnis der Familie 
Hemiuridae (Zool. Jalirb. Abt. Syst. etc. xxvi), note the presence of the receptaculum seminis, 
which has a peculiar structure. After my observation this so-called receptaculum seminis is 
nothing less than the blindly-ending Laurer’s canal which is surrounded by a mass of vesicular 
cells. A diagrammatic figure of this part is given in PI. XXV, fig. 6. A similar structure is met 
with in Distomum sp. from Muraenesox cinereus , Brachyphallus sp., Lecithocladium sp. and 
Didymozoon sp., according to my observations. 
