410 
Digenetic Trematodes in Japan 
The genus Sievingotrema Odhner, 1911, has a close affinity with Didym- 
orchis Linton 1 , and they seem to be identical. 
I have in my possession several other species of Digenea, but their examina¬ 
tion is incomplete; the publication of their descriptions must be postponed. 
EXPLANATION OF PLATES XXIV—XXVI. 
PLATE XXIV. 
Fig. 1. Microtrema truncation n. g., n. sp. x 10. 
Fig. 2. Eurytrema pancreaticum (Janson). x 5. 
Fig. 3. Eurytrema coelomaticum (Giard and Billet), x 5. 
In Figs. 2 and 3 merely the outline of suckers and gonads are given. 
Fig. 4. Eurytrema satoi n. sp. x 18. 
Fig. 5. Dicrocoelium macaci n. sp. x 20. 
Figs. 6-8. Ditto, showing various shapes and situations of the body and the gonads, x 10. 
Fig. 9. Cricocephalus Icoidzumii n. sp. x 14. 
PLATE XXV. 
Fig. 1. Watsonius macaci n. sp. x 5. 
Fig. 2. Fasciolopsis buski (Lank.), showing excretory vesicle, x 3. 
Fig. 3. Ditto; longitudinal section of the skin and the underlying tissues of the ventral part 
of body, x 170. 
Fig. 4. Polyangium miyajimai n. sp. x 10. 
Fig. 5. Octangium takanoi n. sp. The uterus is not figured, x 10. 
Fig. 6. Diagrammatic illustration of the Laurer’s canal, the ootype and their vicinity of Lecitfio- 
chirium sp. x 120. 
Fig. 7. Sterigotrema nagazawai n. sp. 
PLATE XXVI. 
Fig. 1. Leptolecithum eurytremum n. g., n. sp. x 10. 
Fig. 2. Lecithochirium sp. x 10. 
Fig. 3. Lepodora sp. x 20. 
Fig. 4. Didymozoon sp. x 40. 
Fig. 5. Exorchis oviformis n. g., n. sp. x 200. 
Fig. 6. Ditto; young, encysted worm, x 40. 
REFERENCE LETTERS. 
c.p. — cirrus-pouch; c'p' = cirrus-pouch-like organ; cu. =cuticula; d. eg. = ductus ejaculatorius; 
ex. n. = peripheral network of the excretory vesicle; ex. v.= excretory vesicle; g.= genital pore; 
int. = intestine; L.c. =Laurer’s canal; o. =ovary; o.s. =oralsucker; oes. = oesophagus; ot. =ootype; 
ovd. = oviduct; p. b. = pharyngeal bulb, or muscular part of the oesophagus; p. s. = posterior 
sucker; ph. = pharynx; prep. = prepharynx; r. sem. =receptaculum seminis; s. c. = subcuticular 
cells; sh. gl. = shell gland; sp.= spine; t.~ testis; u.= uterus; v. sem. — vesicula seminalis; vag. 
= vagina; vit. = vitellarium. 
1 Linton, E. (1910), l.c. 
