Source: Isolated from a spoiled, salted ham; also from soil from Equatorial Africa. Habitat: Probably decomposing organic material. 2. Eubacteriuni niosii (Hauduroy et al., 1937) Prevot, 1938. (Anaerobe Bacillus, Niosi, Cent. f. Bakt., I Abt., Orig., 58, 1911, 193; Bacteroides niosii Hauduroy et al., Diet. d. Bact. Path., 1937, 65; Pr6vot, Ann. Inst. Past., 60, 1938, 294.) ni.o'si.i. M.L. gen. noun niosii of Niosi; named for F. Niosi, the bacteriologist who first isolated this organism. Short, thick rods, 0.8 to 1.2 by 1.0 to 1.5 microns, with rounded ends, occurring singly, in pairs, in V-formation, in short chains and in clumps. Non-motile. Gram- positive in pus and in young cultures. Gas and fetid odor produced in culture media. Gelatin: No growth. Deep agar colonies: Small, lenticular, becoming mulberry-like. Gas is produced. Glucose broth: Turbid. Gas and fetid odor produced. Tarozzi broth: Abundant turbidity. Very fetid odor. Milk : Coagulated in 5 days ; curd digested. Indole not produced. Anaerobic. Optimum temperature, between 20° and 37° C. Pathogenic for rabbits and guinea pigs. Source: Isolated from a case of suppura- tive pleurisy. Habitat: Respiratory tract. Uncommon. 3. Eubacterium obstii Prevot, 1938. (Bacillus B, Obst, Jour. Inf. Dis., U, 1919, 159 and 168; Eubacterium obsti (sic) Prevot, Ann. Inst. Past., 60, 1938, 294.) ob'sti.i. M.L. gen. noun obstii of Obst; named for M. Obst, the bacteriologist who first isolated this organism. Short, straight rods. Non-motile. Gram- positive. Gas produced in culture media. Deep agar colonies: Discoid. Gas is pro- duced. Blood agar colonies: Discoid. Hemolysis. Blood media: Abundant growth. Fetid gas produced. Indole not produced. Acid and gas from glucose. Ammonia, amines and nitrogen are pro- duced. Anaerobic. Optimum temperature, 37.5° C. Killed at 65° C. Pathogenic for mice, guinea pigs and marine fish, causing death. Source: Isolated from the intestines of copepods, schizopods and shrimp. Habitat: Found in sea water and in the intestines of marine fish. Rather common. 4. Eubacterium rectale (Hauduroy et al., 1937) Prevot, 1938. (Un bacille an- aerobic, Grootten, Compt. rend. Soc. Biol., Paris, 102, 1929, 43; Bacteroides rectalis Hau- duroy et al.. Diet. d. Bact. Path., 1937, 72; Prevot, Ann. Inst. Past., 60, 1938, 294.) rec'ta.le. L. part. adj. rectus straight; M.L. neut.n. rectum the straight bowel, rectum; M.L. adj. rectalis rectal. Straight or curved rods, 0.8 by 3.0 mi- crons, with rounded ends; sinuous filaments up to 20.0 microns in length may also occur. Non-motile. Gram-positive. Gas produced in culture media. Gelatin: No liquefaction. Deep agar colonies: Spherical, 1 to 2 mm in diameter, arborescent. Medium broken by gas. Glucose broth: Abundant turbidity which precipitates. Fetid gas produced. Blood broth: Hemolysis in 24 hours. Milk: Acidified; coagulated in 3 weeks. Gas is produced. Coagulated proteins not attacked. Hydrogen sulfide is produced. Acid and gas from glucose, maltose and lactose. Neutral red reduced in 24 hours. Anaerobic. Optimum temperature, 37° C. Killed at 56° C. Source: Isolated in association with a rectal ulcer. Habitat: Found in the rectum. Very un- common. 5. Eubacteriuni quartum Prevot, 1938. (Anaerob No. IV, Rodella, Ztschr. f. Hyg.,
