19. _Bothriocephalus latus_, _B. cordatus_, and _B. cristatus_ 112 20_a._ General literature of hydatids (English) 141 _b._ Hydatids of the liver 142 _c._ " " and other organs together 143 _d._ Liver hydatids. American cases 144 _e._ Hydatids of the lungs and pleura 144 _f._ " of the kidney 144 _g._ " of the spleen, omentum, and abdominal cavity 144 _h._ " within the pelvic cavity 145 _i._ " of the heart and blood-vessels 145 _k._ " of the brain and cranial cavity 145 _l._ " of the bones 145 _m._ " of the breast, muscles, and soft parts 146 _n._ " of uncertain seat 146 _o._ " of animals 147 _p._ " in man. Foreign literature 147 21. _Trichina spiralis._ English literature 174 " Foreign literature 177 22. _Trichocephalus dispar_ 180 23. _Filaria Bancrofti_ (_F. sanguinis hominis_) 202 Supplement (Hæmatozoa) 488 24. _Filaria loa_ 206 25. " _lentis_ 206 26. " _labialis_ 207 27. " _trachealis_ and _F. bronchialis_ 208 28. _Eustrongylus_ (_Strongylus_) _gigas_ 210 29. _Dochmius duodenalis_ 216 30. _Dracunculus medinensis_ 224 31. _Oxyuris vermicularis_ 232 32. _Leptodera_ (_Anguillula_) _stercoralis_ and _L. intestinalis_ 235 33. _Ascaris mystax_ 241 34. " _lumbricoides_ 251 35. _Echinorhynchus gigas_ 257 36. _Sanguisuga medicinalis_ and other leeches 259 37. _Pentastoma tænioides_ and _P. constrictum_ 265 38. _Demodex_, _Sarcoptes_, and other Arachnidan ectozoa 268 39. _Gammarus pulex_ in man 269 40. Bugs, lice, and other insect parasites of man 275 41. _Psorospermiæ_, _Gregarinæ_, and other protozoa 283 42. _Entozoa_ of monkeys 293