Class I. SARCODINA, Bütschli, 1882 29 Order. _Amœbina_, Ehrenberg 29 A. Human Intestinal Amœbæ 29 _Entamœba coli_, Lösch, 1875, emend. Schaudinn, 1903 32 _Entamœba histolytica_, Schaudinn, 1903 34 _Entamœba tetragena_, Viereck, 1907 38 Noc’s Entamœba, 1909 41 _Entamœba buccalis_, Prowazek, 1904 43 _Entamœba undulans_, Castellani, 1905 43 _Entamœba kartulisi_, Doflein, 1901 44 _Amœba gingivalis_, _A. buccalis_, _A. dentalis_ 44 Genus. _Paramœba_, Schaudinn, 1896 44 _Paramœba (Craigia) hominis_, Craig, 1906 45 B. Amœbæ from other Organs 45 _Entamœba pulmonalis_, Artault, 1898 45 _Amœba urogenitalis_, Baelz, 1883 45 _Amœba miurai_, Ijima, 1898 46 _Appendix_: “Rhizopods in Poliomyelitis Acuta” 46 Order. _Foraminifera_, d’Orbigny 47 Sub-order. _Monothalamia_ (Testaceous Amœbæ) 47 Genus. _Chlamydophrys_, Cienkowski, 1876 47 _Chlamydophrys enchelys_, Ehrenberg 47 _Leydenia gemmipara_, Schaudinn, 1896 49