Vin LIST OF ILLUSTRATIONS, 



17. Tnchosomoides crassicauda. Eggs containing embryos, Bhowing variations 



in shape 18 



18. Trichosomoides crassicauda. Embryo 19 



19. Trichosomoides crassicauda. Embryo 19 



20. Trichuris fossor. Posterior extremity of male, int., intestine; sp., 



spicule; vas., vesicula seminalis 22 



21. Trichuris infundibulus. Posterior extremity of male 23 



22. Trichuris leporis. Cross-section of the esophageal portion of the body, 



showing the prominent ventral bacillary band and the relation of the 



esophageal tube to the cell body 24 



23. Trichuris leporis. Anterior extremity of body, showing cuticular plaques. 24 



24. Trichuris leporis. Posterior extremity of male, showing sheath and 



spicule 25 



25. Trichuris leporis. Vulva, region of female, showing pocketing in vagina. . 25 



26. Trichuris leporis. Egg 25 



27. Trichuris muris. Anterior extremity of body, showing cuticular vesicles.. 26 



28. Trichuris muris. Posteriorextremity of male, showing spicule and sheath. 26 



29. Trichuris opaca. Male 27 



30. Trichuris opaca. Posterior extremity of male 27 



31. Trichuris opaca. Female 28 



32. Trichuris ovis. Male at right, female at left. Vulva 29 



33. Trichuris ovis. Posterior end of male, showing sheath (sh) and spicule 



(sp) 29 



34. Tridmris ovis. Egg 30 



35. Hepaticola hepatica. Egg 31 



36. Hepaticola hepatica. Egg of Trichosome from liver of Lepus europaeu^... 33 



37. Capillaria ransomia. Posterior extremity of male 34 



38. Capillaria ransomia. Egg 34 



39. Capillaria badllata. C'ross-section of posterior (postvulvar) part of body, 



showing dorsal and ventral bacillary bands 34 



40. Capillaria badllata. Posterior extremity of male, showing sheath 34 



41. Capillaria badllata. Female in region of vulva 35 



42. Capillaria annulosa. Female in region of vulva 36 



43^5. Capillaria schmidti. Head of male. Cuticle, showing annular inter- 

 ruptions of longitudinal striations. Posterior extremity of male, show- 

 ing spicule 38 



46. Ascaris pigmentata. Lateral view of head 41 



47. Crossophorus collaris. Lateral view of head 42 



48. Crossophorus collaris. Median view of the dorsal lip 43 



49. Crossophorus collaris. Posterior extremity of male, ventral view 43 



50. Ileterahis spumosa. Anterior extremity of female 45 



51. Ileterahis spumosa. Posterior extremity of male; ventral view 46 



52. Ileterahis spumosa. Posterior extremity of male; lateral view 46 



53. Ileterahis spuTuosa. Caudal sucker of male; ventral \'iew 47 



54. Ileterahis spumosa. Vulva region of female 48 



55. Faraspidodera undnata. Lateral view of head 49 



56. Faraspidodera undnata. Posterior extremity of male; ventral view 50 



57 . Faraspidodera undnata. Posterior extremity of male; lateral view 50 



58. Subulura andersoni. Posterior extremity of the male (a) and of the fe- 



male (b) 53 



59. Subulura undnata. Posterior extremity of male; ventral \aew 54 



60. Subulura boueti. Posterior extremity of male; ventral view 55 



