PLATE III. 



Fig. 16. — Ogmogaster plicatus (Creplin) ; ex Leptonychotes weddelli. Ventral view; a, oral sucker; b, 

 wavy margin of body ; gp, genital pore ; ov, ovary ; r, rugae ; f, t', testes ; ut, uterus ; y, 

 yolk-glands. 



Fin. 17. — Hemiurus oatesi, Leiper and Atkinson ; ex Trematomus bemaccMi. a. oral sucker ; b, ventral 

 sucker ; c, cirrus ; d, abdomen ; ex, excretory vesicle ; g, branch of gut ; gp, genital pore ; 

 017, ovary ; pit, pharynx ; sv, seminal vesicle ; t, t', testes ; ut, uterus ; y, y', yolk-glands. 



Fig. 18. — Aponurus bowersi, Leiper and Atkinson ; ex Trematomus bemaccMi. Lettering as in Fig. 17, 



Fig. 19. — Podocotyle pennelli, Leiper and Atkinson ; ex Trematomus bemaccMi. Lettering as in Fig. 17. 



Fig. 20. — Lepodora garrardi, Leiper and Atkinson ; ex Trematomus bemaccMi. Lettering as in Fig. 17. 



Fig. 21. — Allocreadium fowleri, Leiper and Atkinson ; ex Trematomus bemaccMi. Immature form. Letter- 

 ing as in Fig. 17. 



