LIST OF ILLUSTRATIONS. 
Figs. 1-67. Hymenolepis nano. Page. 
1. Original type figure of Tsenia nana Siebold; head and portion of 
strobila 16 
2. Original type figure of Tsenia murina Dujardin f =H. nana ) ; head and 
strobila 16 
3. Head and strobila of H. nana 16 
4. Head and portion of strobila of H. nana - 16 
5. Head and strobila of H. nana 17 
6-7. Heads of JT. nana 19 
8. Head of H. nana from which the suckers have been torn away 19 
9. Head and neck of H. nana 19 
10. Head of //. nana 19 
11. Head and anterior portion of strobila of IT. nana 19 
12. Head of //. nana 20 
13. Head of /i. na? 2 a, with protracted rostellum 20 
14. Head of 7’. rnwWna Dujardin {=H.nana); original type figure 20 
15. Head of T. murina Dujardin {=If. nana) with protracted rostelluin; 
original type figure 20 
16-21. Hooks of 7f. nana 21 
22. Proglottid of T. murina Dujardin {=11. nana)-, original type figure .. 23 
23. Proglottids of 7F. nana 23 
24. Proglottid of H. nana, showing reproductive organs 23 
25. Portion of strobila of H. nana, 1 mm. behind head 25 
26. Proglottids of 77. nana, with cirrus pouch and ovary 25 
27. Proglottids of H. nana, showing cirrus pouch, seminal receptacle, 
^ ovary, and testes 25 
28. Proglottids of 77. nana, showing cirrus pouch, seminal receptacle, 
immatura ova, lateral longitudinal excretory canals 25 
29. Gravid proglottids of 77. nana 25 
30. Posterior end of 77. nana, with sterile proglottid 26 
31. Portion of strobila of 77. nana 26 
32. Cross section of proglottid of 77. nana from man 28 
33. Same from rat 28 
34-45. Eggs of 77. nana 29-32 
46-67. Embryos of 77. nana in various stages of development 36-41 
68-107. Hymenolepis diminuia. 
68-70. Strobilse of 77. dimimda, natural size 82, 83 
71. Head and neck of 77. diminuta 85 
72. Head and anterior portion of 77. diminuta 85 
73-74. Heads of 77. diminuta 85 
75. Proglottid of 77. diminuta, showing male organs 86 
76. Same, showing female organs 86 
77. Proglottids of 77. -diminuta, showing usual and unusual positions of 
testes 86 
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