Plate VIII, 
Fig. 1. Distoma from muscles of Coitus bubalis. X 00 diameters. 
Fig. ‘2. Appearance of the posterior end of the Distoma after pressure. 
Similarly magnified. 
Fit/. 3. Mesostomum bijidum, n. sp. x 00 diam. 
Fig. 4. Penis of the foregoing-, x 350 diam. 
Fir/. 5. Rod-shaped bodies and granules from the testes of the specimen. 
X 350 diam. 
Fir/. 0. Fully developed spermatozoa of the same animal. 
Fit). 7. Vortex capitatix, (Erst. x about 200 diam. a, muscular pro¬ 
boscidian organ, not ciliated; a' , secondary and probably 
exsertile muscular organ ; j, oesophageal division; f, central 
digestive chamber ; j", posterior digestive chamber ; z, anus ; 
m, cilia of the organ homologous with the cephalic, sac of the 
Nemerteans ; tl, clear papilla with active though short cilia 
(in some views a duct-like structure passes inwards from d) 
h, clear globule capable of contraction under pressure ; i, radiate 
appearance at genital sphincter (P) ; k, sperm-sacs : w, mouth. 
Fig. 8. Another specimen, showing ova. Similarly magnified, ov, ovft. 
Fig. 9. Cells of the alimentary region, x 350 diam. 
Fig. 10. Spermatozoa of Vortex capitata. X 700 diam. 
Fig. 11. View of an Eel (which was choked while endeavouring to 
swallow a fellow eel). 
