BY T. HARVEY JOHNSTON AND O. W. TIEGS. 129 



Wegener, G., 1910. — Die Ektoparasiten der Fiselie ostpreussens. Inaug. Diss. 



Jena. 

 WiLLEM, v., 1906. — Deux Trematodes nouveaux par la faune beige. Bull. Acad. 



roy. Belg., pp. 599-612. 



Explanation of lettering. 



a.d. attaching disc; h.c. buccal cavity; b.ej. bulbus ejaculatorius; br. brain; 

 c. cirrus; c.b.a. ohitinous basal apparatus; e.g. cephalic glands; e.m.l. circular 

 muscle layer; c.s. cirras-sac; ct. cuticle; c.v.d. converging vitelline ducts; d. ducts 

 from glands; d.p. dermal papillae; e. eggs; E. eye; ex. excretory ducts; ex.o. 

 opening of excretory duets; g.c. gland-cells; g.ch. genital chamber; g.o. one of 

 the female genital openings; h. major hook; h.a. book apparatus in section; h.l. 

 head-lappet; h.o. "head-organ"; i. intestine; i.e. intestinal caeca; i.e.l. inner cir- 

 cular muscle-layer; l.m.l. longitudinal muscle-layer; m. mouth; m.h. minor hooks; 

 od. oviduct; oe. oesophagus; ov. ovary; p.g. penial glands; ph. pharynx; pr. 

 prostate gland; p.t. padding tissue; pt. vd. posterior transverse vitelline duet; 

 r.s. receptaculum seminis; s.c.t. subcuticular tissue; sh.g. shell-glands; s.m. 

 sphincter muscle; s. spine; *. testis; t.vd. transverse vitelline duct; u.o. uterine 

 opening; ut. uterus; v. vitellaria; v.d. vas deferens; v.g. vagina; v. g.c. gland- 

 cells whose ducts open ventrally; v.r. vitelline reservoir; v.s. vesicula seminalis; 

 X. opening of transverse vitelline duct into intestine. 



EXPLANATION OF PLATES IX.— XXII. 



Plate ix._ 



Fig'S. 1-5. Protogyrodactylus quadratus. 



1. Entire animal, ventral view; 2. Cirrus and adjacent structures; 3. Transverse 



section through posterior transverse yolk- duct, showing opening into the intestine; 



4. Longitudinal vertical section at about mid-region of worm; 5. Egg. 



Plate X. 

 Fig. 6. Protogyrodactylus qicadratus. 

 Disc in ventral view. 



Fig. 7. TriviteUina subrotunda. 

 Entire animal, ventral view. 



Figs. 8-9. Anchylodiscus tandani. 



8. Entire animal, ventral view ; 9. Disc in side view. 



Plate xi. 



Figs. 10, 12-14. HaUotrema australe. 



10. Disc in ventral view; 12. Major hooks and supporting apparatus; 13. Entire 



animal, ventral view ; 14. Cirrus. 



Fig. 11. Anchylodiseiis tandani. 

 To show the relative size of egg. 



Plate xii. 

 Figs. 15-19. Daitreosoma constrictiim. 

 15. Entire animal; 16 Attaching disc; 17. Egg; 18. Large hooks; 19. Trans- 

 verse section in region of body constriction. 



Plate xiii. 

 Fig. 20. Daitreosoma eonstrictum. 

 Reproductive organs. 



