Organisms arranged singly; amines, ammonia and nitrogen produced Eiibactcriuiii p. 562 {E. obstii) Organisms arranged predominantly in Y-shaped forms suggestive of false branching; acid from glucose and galactose; gelatin not liquefied. . . .Kamibaclerium p. 563 (R. pleuriticum) (See also Corynehacterium diphtheroides .) 45. No acid from carbohydrates Eubaclerium p. 552 Acid from carbohydrates 46 46. Acid from glucose, lactose and fructose 49 Acid from glucose and lactose but not from fructose. . . .Catenabacterium p. 560 (C. lottii) (See also Lactobacillus caucasicus.) Acid from glucose and fructose but not from lactose 47 Acid from glucose but not from lactose or fructose 53 47. Organisms pathogenic to mice and rabbits; cause urinary-tract infection in horses, cattle, sheep and dogs; propionic acid not produced from lactic acid; strictly ana- erobic Corynebacterium p. 579 (C. renale) Not as above 48 48. Organisms found mainly in fermenting foods; propionic acid produced from lactic acid; microaerophilic to anaerobic Propionibacterium p. 569 No propionic acid produced from lactic acid; microaerophilic to anaerobic Lactobacillus p. 542 49. Butyric acid produced 50 Propionic acid produced 51 No propionic or butyric acid produced 52 50. Organisms occurring in very long chains Catenabacterium p. 560 (C catenaforme) Organisms occurring singly, in pairs and in clumps Eubacterium p. 552 {E. parvum) (See also Corynebacterium avidum.) 51. Strictly anaerobic Eubacterium p. 552 {E. disciformans) Microaerophilic to anaerobic; propionic acid produced from lactic acid; catalase-posi- tive Propionibacterium p. 569 52. Long rods, 0.3 by 8.0 microns, with tapered, rounded or swollen ends; often occurring in short or long chains Catenabacterium p. 560 (C. leptotrichoides) Slender rods, 0.5 to 0.7 by 2 to 8 microns, occurring in short or long chains; bifurcations common; produce lactic and volatile acids from glucose; microaerophilic to anaerobic Lactobacillus p. 5^2 Rods 1.0 by 3.0 microns; produced in short or long chains; acetic and lactic acids pro- duced from glucose Eubacterium p. 552 Note: E. crispatum has a similar sugar-fermentation range to that of Lac- tobacillus bifidus, but acetic acid appears to predominate. 53. Propionic acid produced 55 Butyric acid produced from lactic acid; acid from glucose and maltose Butyribacterium p. 577 (B. retigeri) No propionic or butyric acid produced 54 54. Organisms arranged in short to very long chains Catenabacterium p. 560 {C. nigrum) Organisms occurring singly and in groups arranged in a palisade or Chinese-letter fashion Corynebacterium p. 579 (C. granulosum and C. parvum)
