434 GENERAL SYSTEMATIC BACTERIOLOGY 



Protomycetum. Lewis (1879, p. 394) makes the following state- 

 ment concerning S-pirillum obermeieri. 



Since the period of its discovery in the blood by Obermeier it has been referred 

 to under various names: Spirothrix, Protomycetum recurrentis, in Lebert's article 

 on recurrent fever and in Ziemss' 'Handbuch' of Medicine, Spirillum by Erich- 

 sen, Litten, Birch-Hirschfeld etc.; Spirillum tenue by Naunyn; and Spirochoete 

 Obermeieri by Cohn (fig. 15), 



Pseudobacterium. Trevisan (1888, p. 781) included this name in 

 the following sentence: 



Senze dipartirci da Klebsiella, basterebbe ricordare come, tra le specie che 

 attualmente se ne conoscono, altre s'ebbero le denominazioni generiche Micro- 

 coccus, Diplococcus, Pseudodiplococcus, edaltre quelle di Bacterium, Pseudobac- 

 terium, Proteus, Bacillus, Ascobacillus, etc. 



What organism is referred to is not evident. 



Pseudodiplococcus. A generic name used by Bonome (1888, p. 

 321) to designate Pseudodiplococcus pneunionicus, an organism which 

 he isolated from a fibrinous exudate. The organism is stated to re- 

 semble closely morphologically and biologically the "Diplococcus 

 pneumoniae." 



The organism is termed Klebsiella Leijdeni by Trevisan (1889, p. 

 1030). The genus has not been recognized by other authors. It may 

 be regarded as a synonym of Diplococcus. 



Pseudomeningococcus. A casual name proposed by Elser and 

 Huntoon (1909, p. 384) for "a group of organisms which cannot be 

 differentiated from the meningococcus excepting by serum reactions." 



Pseudomonadaceae. The third family of the Eubacteriales named 

 by Winslow et cd. (Committee Soc. Am. Bact., 1917, p. 555) with the 

 following description. 



Short rods, usually motile. Flagella single, polar. Gram-negative. Not 

 obligate aerobes. Many species active ammonifiers. Many species produce 

 water-soluble pigments or green fluorescence; yellow pigment common. Some 

 species are photogenic. Soil and water bacteria, with many plant parasites. 



The single genus Pseudomonas is included. 



Pseudomonadales. A name proposed by Orla- Jensen (1921, p. 

 270) as one of the two orders into which he would divide Eubacteriales 

 Buchanan. He would include in this group some eleven genera as 

 follows: 1. Methanomonas, 2. Carboxydomonas, 3. Hydrogenomonas, 

 4. Nitrosomonas, 5. Nitromonas, 6. Azotomonas, 7. Rhizomonas, 8. 

 Acetimonas, 9. Fluormonas, 10. Photomonas, 11. Spiromonas. 



