GENERAL SYSTEMATIC BACTERIOLOGY 429 



Plocamobacterium. Lowi (1920, p. 730) proposed the name Plo- 

 camohacterium crassum for Bacillus crassus Lipschiitz. The organism 

 is a gram positive facultative anaerobe, with characteristic growth on 

 Drigalski agar, maltose nutrose agar and dextrose agar. The cells 

 in young cultures are small rods, while in older cultures they are fila- 

 mentous. Non-motile. No spores. A common inhabitant of the 

 normal vagina, but occasionally pathogenic causing acute ulcer of the 

 vulva. 



Pneumobacillus. This name has been used commonly as a quasi- 

 scientific name for the organism described by Friedlander as the causal 

 organism of pneumonia. Arloing (1889, p. 428) proposed the name 

 Pneumobacillus liquefaciens bovis for the organism which he isolated 

 as the cause of contagious peripneumonia of cattle. The use of the 

 name in a trinominal would appear to invalidate it as a generic designa- 

 tion. It has never come into common use. This organism was later 

 termed Bacterium bovis (Arloing) Migula (1900, p. 442). 



The name is placed by Erwin F. Smith (1905, p. 162) among the 

 rejected genera. 



Pneumococcus. A name usually used as a casual designation of 

 the organism of pneumonia. It was apparently first used in a generic 

 sense by Arloing (1889, p. 430) who named three species, Pneumococcus 

 gutta-cerei, P. lichenoides and P. flavescens, all present together with 

 Pneuomobacillus liquefaciens bovis in bovine pleuropneumonia. The 

 species are inadequately described. 



It has occasionally apparently been used in a generic sense by other 

 writers as witness Schmidlechner (1905, p. 291) who uses the designa- 

 tion Pneumococcus lanceolatus Fraenkel in a list of species. 



The name Pneumococcus mucosus is used also by Dochez and Avery 

 (1915, p. 114) and by Lyall (1915, p. 146). It is placed by Erwin F. 

 Smith (1905, p. 162) in his list of rejected genera. 



Pneumococcus is probably best regarded as a synonym of Diploccocus. 



Pollendera. According to De Toni and Trevisan (1889, p. 943) 

 this generic name was used by Trevisan (1884) for the anthrax bacillus 

 which he named Pollendera anthracis. 



The original reference to this use by Trevisan has not been dis- 

 covered by the writer. The name has not been used by other authors, 

 and is rejected later by Trevisan as a synonym of Bacillus. 



It would seem that this name would become vaHd if non-motile 

 rod-shaped bacteria are to be grouped in a genus. It certainly would 

 have priority over Bacterium in the sense of Migula and over Aplano- 

 bacter E. F. Smith. 



