_Trypanosoma hippicum_, Darling, 1910 98 _Endotrypanum schaudinni_, Mesnil and Brimont, 1908 99 _Trypanosoma boylei_, Lafont, 1912 99 Monomorphic Trypanosomes 99 _Trypanosoma vivax_, Ziemann, 1905 99 _Trypanosoma capræ_, Kleine, 1910 100 _Trypanosoma congolense_, Broden, 1904 100 _Trypanosoma simiæ_, Bruce, 1912 100 _Trypanosoma uniforme_, Bruce, 1910 101 General Note on Development of Trypanosomes in Glossina 101 Adaptation of Trypanosomes 101 Genus. _Herpetomonas_, Saville Kent, 1881 102 Genus. _Crithidia_, Léger, 1902, emend. Patton, 1908 104 Genus. _Leishmania_, Ross, 1903 104 _Leishmania donovani_, Laveran and Mesnil, 1903 105 _Leishmania tropica_, Wright, 1903 107 _Leishmania infantum_, Nicolle, 1908 109 Genus. _Histoplasma_, Darling, 1906 112 Genus. _Toxoplasma_, Nicolle and Manceaux, 1908 112 THE SPIROCHÆTES 114 The Spirochætes of the Blood 116 _Spirochæta duttoni_, Novy and Knapp, 1906 116 _Spirochæta gallinarum_, Stephens and Christophers, 1905 (= _Spirochæta marchouxi_, Nuttall, 1905) 119 _Spirochæta recurrentis_, Lebert, 1874 120 _Spirochæta rossii_, Nuttall, 1908 122 _Spirochæta novyi_, Schellack, 1907 122 _Spirochæta carteri_, Mackie and Manson, 1907 122 _Spirochæta berbera_, Sergent and Foley, 1910 122 Other Human Spirochætes 122 Some Animal Spirochætes 122 TREPONEMATA 124 _Treponema pallidum_, Schaudinn, 1905 124 _Treponema pertenue_, Castellani, 1905 127