branes of mammals but may take a part in various pathological processes (Burdon). 12. Bacteroides ovatus Eggerth and Gagnon, 1933. (Eggerth and Gagnon, Jour. Bact., ^5, 1933, 405; Pasteurella ovata Prevot, Ann. Inst. Past., 60, 1938, 292.) o.va'tus. L. adj. ovatus ovate, egg-shaped. Small, ellipsoidal rods, 0.5 to 1.0 by 1.0 to 2.0 microns, occurring singly. Non- motile. Stain solidly. Gram-negative. Gelatin: Liquefaction in 4 days. Blood agar colonies: Soft, grayish ele- vated colonies, 1.0 to 1.5 mm in diameter. Broth: Diffuse, heavy growth. Milk: Acidified and coagulated in 4 days. Indole is produced. Hydrogen sulfide is produced. Acid and a small amount of gas from esculin, amygdalin, cellobiose, dextrin, fructose, galactose, glucose, glycogen, inu- lin, lactose, maltose, mannose, raffinose, rhamnose, starch, sucrose and xylose. No acid or gas from arabinose, glycerol, manni- tol, melezitose, salicin, sorbitol or trehalose. Nitrites not produced from nitrates. Peptone: No gas. Anaerobic. Non-pathogenic for white mice or rabbits. Source: One strain was isolated from human feces. Habitat: Probably the intestinal canals of mammals. 13. Bacteroides convexus Eggerth and Gagnon, 1933. (Eggerth and Gagnon, Jour. Bact., 25, 1933, 406; Pasteurella convexa Prevot, Ann. Inst. Past., 60, 1938, 292.) con. vex 'us. L. adj. convexus convex. Thick, ellipsoidal rods, 0.8 to 1.5 microns long, occurring singly or in pairs. In glucose broth, the rods are usually 2.0 to 3.0 microns long. Non-motile. Gram-negative. Gelatin: Liquefaction in 20 to 30 days. Blood agar colonies: Elevated, grayish, somewhat opaque colonies, 1.0 to 1.5 mm in diameter. Broth: Heavy diffuse growth. Milk: Acidified and coagulated in 4 days. Indole not produced. Hydrogen sulfide is produced. Acid and a small amount of gas from esculin, amygdalin, cellobiose, dextrin, fructose, galactose, glucose, glycogen, inulin, lactose, maltose, mannose, raffinose, starch, sucrose and xylose. No acid or gas from arabinose, glycerol, mannitol, melezi- tose, rhamnose, salicin, sorbitol or tre- halose. Nitrites not produced from nitrates. Peptone: No gas. Anaerobic. Non-pathogenic for white mice or rabbits. Source: Five strains were isolated from human feces. Habitat: Probably the intestinal canals of mammals. 14. Bacteroides coagiilans Eggerth and Gagnon, 1933. (Eggerth and Gagnon, Jour. Bact., £5, 1933, 409; Pasteurella coagulans Prevot, Ann. Inst. Past., 60, 1938, 292.) co.a'gu.lans. L. part. &&]. coagulans curd- ling, coagulating. Rods, 0.5 to 2.0 microns long. Show bi- polar staining. Non-motile. Gram-negative. Gelatin: Liquefied in 8 to 12 days. Blood agar colonies: Soft, transparent, 0.5 mm in diameter. Broth: Diffuse growth. Milk: Coagulated in 8 days without acid production. The coagulum partly redis- solves after 3 to 4 weeks. Indole is produced. Hydrogen sulfide is produced. Nitrites not produced from nitrates. Anaerobic. Non-pathogenic for white mice or rabbits. Distinctive characters: No acid or gas from carbohydrates. A small amount of gas is produced from peptone. Phenol red and brom cresol purple are decolorized in a meat infusion broth. Source: One strain was isolated from human feces. Habitat: Probably the intestinal canals of mammals. 15. Bacteroides putredinis (Weinberg et al., 1937) Kelly, couih. nov. (Bacillus A, Heyde, Beitr. z. klin. Chirurg., 76, 1911, 1; Bacillus 'putredinis Weinberg et al., Les Microbes Ana^robies, 1937, 755; not Bacillus putredinis Trevisan, Add. ad Gen., p. 36;
