LIST OF ILLUSTRATIONS. 



Page. 



Fig. 1. Davainea rhynchota: Head and anterior portion of strobila 11 



2. Davainea rhynchota: Hooks; (a) large hook from rostellum, (6) small 



hook from rostellum, (c) hook from sucker 12 



3. Davainea rhynchota: Sexuall)' mature segment, horizontal section 12 



4. Davainea rhynchota: Gravid segment, horizontal section 13 



5. Davainea comitata: Head and anterior portion of strobila 15 



6. Davainea comitata: Hooks; (a) from sucker, {h) from rostellum 15 



7. Davainea comitata: Sexually mature segment, reconstruction from sec- 



tions, ventral view 16 



8. Davainea comitata: Gravid segment, ventral view 17 



9. Liga brasiliensis: Entire worm 22 



10. Liga brasiliensis: Rostellum, extruded 23 



11. Liga brasiliensis: Hooks from rostellum 23 



12. Liga brasiliensis: Sexually mature segment 23 



13. Liga brasiliensis: Gravid segment 24 



14. Liga brasiliensis: Egg 25 



15. Rhabdometra nullicollis: Head and anterior portion of strobila 26 



16. Rhabdometra nullicollis: Head and anterior portion of strobila, median 



horizontal section 27 



17. Rhabdometra nullicollis: Sexually mature segment 27 



18. Rhabdometra nullicollis: Sexually mature segment, transverse section. 28 



19. Rhabdometra mdlicollis: Section through cirrus pouch 28 



20. Rhabdometra nullicollis: Section through vagina, seminal receptacle, 



and extruded cirrus 29 



21. Rhabdometra mdlicollis: Gravid segment 29 



22. Rhabdometra nullicollis: Gravid segment 30 



23. Rhabdometra similis: Sexually mature segment becoming gravid, hori- 



zontal section 31 



24. Rhabdometra similis: Sexually mature segment becoming gravid, trans- 



verse section 32 



25. Rhabdometra similis: Section through cirrus pouch and vagina 32 



26. Rhabdometra similis: Gravid segment 33 



27. Anonchotasnia globata: Sexually mature segment, transverse section . . 35 



28. Hymenolepis cantaniana: Entire worm 40 



29. Hymenolepis cantaniana: Egg 41 



30. Diorchis acuminata: Head and anterior portion of strobila 42 



31. Diorchis acumincda: Head with retracted rostellum 43 



32. Diorchis acuminata: Hook from rostellum 43 



33. Diorchis acuminata: Sexually mature segment 44 



34. Diorchis acuminata: Sexually mature segment, transverse section 44 



35. Diorchis acuminata: Sexually mature segment, horizontal section 45 



36. Diorchis acuminaia: Sexually mature segment, horizontal section 45 



37. Diorchis americana: Head 48 



38. Diorchis americana: Hook from rostellum 48 



39. Diorchis americana: Sexually mature segment, at high focus to show 



male organs, dorsal view 49 



40. Diorchis americana: Sexually mature segment, at deep focus to show 



female organs, dorsal view 49 



41. Diorchis americana: Gravid segment, transverse section 50 



42. Diorchis americana: Gravid segments, horizontal section 50 



6 



