420 GENERAL SYSTEMATIC BACTERIOLOGY 



Petalobacillus. A name used by Maggi (1886, p. 174) to designate 

 a growth form of a Bacillus. 



Petalobacteria. A name applied by Billroth (1874, p. 16) to a 

 growth form of his pleomorphic Coccobacteria septica in which the 

 organism assumed a rod shape and formed a flat gelatinous layer of 

 cells. The term has apparently never been used as a generic name. 



Petalobacterium. A name used by Maggi (1886, p. 84) to designate 

 a growth form of Bacterium aceti Zopf. 



Petalococcos. A name apphed by Billroth (1874, p. 6) to a growth 

 form of his pleomorphic Coccobacteria septica in which the cells are 

 spherical and occur arranged in a flat gelatinous mass or plate. 



This name has not been used as a generic designation, although 

 Smith (1905, p. 162) includes " Petalococcus" in his hst of invalid 

 bacterial names. 



Petalococcus. A name included by Erwin F. Smith (1905, p. 162) 

 in his list of rejected genera. See Petalococcos. Maggi (1886, p. 81) 

 gives Petalococcus aceti var Duclauxi as a variety of his Micrococcus 

 aceti. 



Petalo-Gliabacteria. A growth form of Coccobacteria septica as 

 described by Billroth (1874, p. 17). A casual name. 



Pfeifferella. A generic name^ proposed by Buchanan (1916) and 

 (1918, p. 54) as the seventh genus of the subtribe Bacteriinae, with 

 the description: 



Non-motile rods, slender, Gram-negative, without spores, staining poorly, 

 sometimes forming threads and showing a tendency toward branching. Gelatin 

 may be slowly liquefied. Do not ferment carbohydrates. Growth on potato 

 characteristically honey-like. 



The type species is the glanders bacillus, Pfeifferella mallei. 



Winslow et al. (Committee Society of American Bacteriologists, 

 1920, p. 200) used the same description and designate the type species 

 as Pfeifferella mallei (Loeffler) Buchanan. 



Bergey et al. (1923, p. 389) follow Winslow. It is possible that 

 Malleomyces q.v. has priority. 



^ This generic name for the glanders group came into being through a clerical 

 error. The author had intended to propose the name Pfeifferella for the influenza 

 group of bacteria, and Loefflerella for the glanders group. It was suggested by 

 the Committee of the Society of American Bacteriologists that Hemophilus 

 would be an appropriate name for the influenza group, it was intended therefore 

 in manuscript in preparation to eliminate Pfeifferella. Through some inexplic- 

 able clerical mistake Loefflerella was dropped and Pfeifferella substituted in mimeo- 



