berg et al., Les Microbes Ana^robies, 1937, 720). Nitrites not produced from nitrates. Anaerobic. Optimum temperature, 37° C. Pathogenicity: Some strains produce sub- cutaneous abscesses in rabbits, guinea pigs or mice. Source and habitat: From acute appen- dicitis, pulmonary gangrene, abscesses of the urinary tract and septicemias in man. 2. Bacteroides furcosus (Veillon and Zuber, 1898) Hauduroy et al., 1937. (Bacillus furcosus Veillon and Zuber, Arch. Med. Exp. et Anat. Path., 10, 1898, 517; Hauduroy et al.. Diet. d. Bact. Path., 1937, Ql;Ristella furcosa Prevot, Ann. Inst. Past., 60, 1938, 291.) fur.co'sus. L. adj. furcos^is forked. Small rods with forked ends. Non-motile. Gram-negative. Gelatin: No liquefaction. Agar: Deep colonies very small, trans- parent, regular, yellowish. No gas. Blood agar: Small, moist colonies with irregular edges. Broth: Slow growth; fine precipitate; little gas with sourish, fetid odor. Milk: No coagulation. Coagulated egg white not digested. Coagulated serum not digested. Acid and gas from glucose, maltose, su- crose and mannitol. No action on lactose or inulin. Anaerobic. Optimum temperature, 37° C. Pathogenicity: Produces subcutaneous abscesses in guinea pigs. Source: Isolated from cases of appendi- citis and from lung abscesses. Habitat: Found in cases of appendicitis and similar infections in man. 3. Bacteroides perfoetens (Tissier, 1905) Hauduroy et al., 1937. (Cocco-Bacillus anaerohius perfoetens Tissier, These M6d., Paris, 1900, 70; Coccohacillus perfoelans (sic) Tissier, Ann. Inst. Past., 19, 1905, 110; Hauduroy et al.. Diet. d. Bact. Path., 1937, 67; Risiella perfoetens Prdvot, Ann. Inst. Past., 60, 1938,291.) per.foe'tens. L. pref. per very; L. part. adj. foetens stinking; M.L. adj. perfoetens very stinking. Small, ellipsoidal rods, 0.6 to 0.8 by 0.8 to 1.0 micron, occurring singly, in pairs, in short chains or in irregular groups. Non- motile. Gram-negative. Gelatin: No growth. Glucose agar: Deep colonies lenticular, with bubbles of fetid gas. Glucose broth: Rapid growth, with pow- dery precipitate and fetid gas. Milk: Unchanged. Indole not produced. Acid from glucose and sucrose. Some strains produce acid from lactose. Anaerobic. Optimum temperature, 37° C. Not pathogenic. Source: Isolated from the intestines of infants with diarrhoea. Habitat: Found in the intestinal tract of 4. Bacteroides incommunis Eggerth and Gagnon, 1933. (Eggerth and Gagnon, Jour. Bact., 25, 1933, 402; Ristella incom- munis Pr6vot, Ann. Inst. Past., 60, 1938, 291.) in.com.mu'nis. L. adj. incommunis not common . Rods, 0.5 to 1.5 by 1.0 to 3.0 microns, occurring singly. Non-motile. Stain solidly. Gram-negative. Gelatin: No liquefaction. Blood agar colonies: Elevated, slightly yellowish, 1 mm in diameter. One strain formed soft colonies; the other was stringy when emulsified. Broth: Growth is diffuse. Milk: Acidified but not coagulated; coagulates promptly on boiling. Indole not produced. Hydrogen sulfide is produced. Acid and a small amount of gas from amygdalin, arabinose, cellobiose, dextrin, fructose, galactose, glucose, inulin, lactose, maltose, mannose, raffinose, rhamnose, sucrose and xylose. One strain fermented glycogen and starch. No action on esculin, glycerol, mannitol, melezitose, salicin, sorbitol or trehalose. Nitrites not produced from nitrates. Peptone: No gas.
