Plate VIII. 



Fig. 1. Didumii from muscles of Cottus buhdtu. x (JO diameters. 



Fiy. -2. Appearance of the posterior end of the Distoma after pressure. 

 Similarly magmified. 



Fiy. •'). Mesostomum bifidmn, u. sp. x 'W diam. 



Fit/. 4. Penis of the foregoing-, x 350 diam. 



Fig. o. Rod-shaped bodies and granules from the testes of the .specimen. 

 X 350 diam. 



Fig. (!. Fully developed spermatozoa of the same animal. 



Fig. 7. Vorte.i capUata, (Erst. x about I'OO diam. «, muscular pro- 

 boscidian organ, not ciliated ; a , secondary and probably 

 exsertile muscular organ ; J, eesophageal division : /, central 

 digestive chamber ; /', posterior digestive chamber ; s, anus ; 

 m, cilia of the organ homologous with the cephalic sac of tlie 

 Nemerteans ; d, clear papilla with active though .short cilia 

 (in some views a duct-like structm-e passes inwards fromi/) 

 h, clear globule capable of contraction under pressure ; ;', radiate 

 appearance at genital sphincter (?) ; k, spenu-sacs : u: mouth. 



Fig. 8. Another specimen, showing ova. Similarly ma^nitied. ao, ova. 



Fig, '.). Cells of the alimentary region. X 350 diam. 



Fig. 10. Spermatozoa of Voitcv capitata. x 700 diam. 



Fig. 11. A'iew of an Eel (which was choked while endeavouring to 

 swallow a fellow eel|. 



