_Entamœba phagocytoides_ (Gauducheau, 1908). This parasite was discovered in a case of dysentery at Hanoi, Indo-China. The amœba is small, 2 µ to 15 µ in diameter. It is active. It ingests bacteria and red blood corpuscles, while peculiar spirilla-like bodies are found in its cytoplasm. It multiplies by binary and multiple fission. It can be cultivated. More recently (1912) the author appears to consider the amœba to be a stage of a _Trichomonas_, but abandons the view later (1914). Further researches on this organism are needed. _Entamœba minuta_ (Elmassian, 1909)[28] was found, in association with _E. coli_, in a case of chronic dysentery in Paraguay. It resembles _E. tetragena_ but is smaller, rarely exceeding 14 µ in diameter. Schizogony occurs, four merozoites being produced. The encystment is total and endogenous, giving rise to cysts containing four nuclei. This amœba is considered by Darling and others to be the pre-cyst trophozoite stage of _E. histolytica_ (_tetragena_). [28] _Centralbl. f. Bakter._, Orig., lii, p. 335. _Entamœba nipponica_ (Koidzumi, 1909) was found in the motions of Japanese suffering from dysentery or from diarrhœa, in the former case in company with _Entamœba histolytica_. Its diameter is 15 µ to 30 µ. The endoplasm is phagocytic for red blood corpuscles. The nucleus is well defined, resembling that of _E. coli_ and of _E. tetragena_. Multiplication occurs by binary fission and by schizogony. Encystment is total, but has not been completely followed. Darling and others consider that this is an abnormal form of _E. histolytica_, while Akashi (1913) doubts if it is an amœba at all, but rather is to be regarded as shed epithelial cells. GENERAL REMARK.--It is now considered by some workers that true Entamœbæ cannot be cultivated on artificial media. Quite recently Williams and Calkins (1913)[29] have somewhat doubted this opinion, and state that certain cultural amœbæ, originally obtained from Musgrave in Manila, exhibit the various morphological variations associated with true entamœbæ of the human digestive tract. [29] _Journ. of Med. Research_, xxix, p. 43. *Entamœba buccalis*, Prowazek, 1904.