FAMILY PARVOBACTERIACEAE 



575 



2. Ristella melaninogenica. See Bac- 

 teroides melaninogenicus. 



3. Ristella haloseptica (Wyss) Pr^vot. 

 (Bacterium halosepticum Wyss, Mitt. 

 Grenz. Med. u. Chir., 18, 1904, 199; 

 Prdvot, loc. cit., 291.) From a fatal case 

 of osteomyelitis in man. For a descrip- 

 tion of this species, see Manual, 5th ed., 

 1939, 570. 



4. Ristella putredinis (Weinberg etal.) 

 Pr^vot. (Bacillus A, Heyde, Beitr. z. 

 klin. Chirurg., 76, 1911, 1; Bacillus pu- 

 tredinis Weinberg et al., Les Microbes 

 Ana^robies, 1937, 755; Prevot, loc. cit., 

 291 . ) Fifteen strains isolated from acute 

 appendicitis. For a description of this 

 species, see Manual, 5th ed., 1939, 571. 



5. Ristella terebrans (Brocard and 

 Pham) Prevot. (Bacillus terebrans Bro- 

 card and Pham, Compt. rend. Soc. Biol., 

 Paris, 117, 1934, 997; Prevot, loc. cit., 

 291.) Two strains isolated from cases 

 of gangrenous erysipelas, associated with 

 a streptococcus. For a description of this 

 species, see IManual, 5th ed., 1939, 571. 



6. Ristella furcosa (Veillon and Zuber) 

 Prevot. (Bacillus fiircosus Veillon and 

 Zuber, Arch. M^d. Exp. et Anat. Path., 

 10, 1898; Fu^iformis furcosus Topley 

 and Wilson, Princip. Bact. and Immun., 

 1st ed., 1, 1931, 302; Bacter aides furcosus 

 Hauduroy et al., Diet. d. Bact. Path., 

 1937, 61; Prdvot, loc. cit., 291.) From 

 cases of appendicitis and from lung 

 abscesses. For a description of this 

 species, see Manual, 5th ed., 1939, 572. 



7. Ristella putida (Weinberg et al.) 

 Prevot. (Bacillus gracilis putidus Tis- 

 sier and Martelly, Ann. Inst. Past., 16, 

 1902, 865; Bacillus putidus Weinberg 

 et al., Les Microbes Ana^robies, 1937, 

 790; not Bacillus putidus Kern, Arb. 



bakt. Inst. Karlsruhe, 1, Heft 4, 1896, 



* Rearranged by Mrs. Eleanore Heist Clise, New York State Experiment Station, 

 Geneva, New York, December, 1945. 



Distinctive characters : No growth 

 unless serum is added to the medium. 



Source : From epidemic benign cervical 

 adenitis of guinea pigs. 



Habitat : Infected guinea pigs so far 

 as known. 



Appendix I: Additional species which 

 may belong here. 



Bacteroides laevis (Distaso) Bergey 

 et al. (Bacillus laevis Distaso, Cent. f. 

 Bakt., I Abt., Orig., 6^, 1912, 444; Bergey 

 et al.. Manual, 1st ed., 1923, 259; not 

 Bacillus laevis -Frankland and Frank- 

 land, Phil. Trans. Roy. Soc. London, 

 178, B, 1887, 278.) From feces. 



Bacteroides liquefaciens (Distaso) Ber- 

 gey et al. (Coccobacillus liquefaciens 

 Distaso, Cent. f. Bakt., I Abt., Orig., 



59, 1911, 102; Bergey et al.. Manual, 1st 

 ed., 1923, 262.) From feces. 



Bacteroides rigidus (Distaso) Bergey 

 et al. (Bacillus rigidus Distaso, Cent, 

 f. Bakt., I Abt., Orig., 59, 1911, 103; 

 Bergey et al., Manual, 1st ed., 1923, 263.) 



Appendix II*: Prevot (Ann. Inst. Past., 



60, 1938, 285 and Man. de Class, et de 

 D^term. des Bact. Anaerobies, 1940, 38) 

 has arranged some of the anaerobic, non- 

 spore-forming. Gram -negative, largely 

 parasitic rods in two families, Ristellaceae 

 and Spherophoraceae, as follows : 



Family Ristellaceae Prevot. 



(Ann. Inst. Past., 60, 1938, 288.) 



Genus I. Ristella Prevot. 



(Lcc. cit., 289.) 



Straight or slightly bent, non-motile 

 rods. Not capsulated. Gram-negative. 

 Anaerobic. 



1. Ristella fragilis. See Bacteroides 

 fragilis. 



