GENERAL SYSTEMATIC BACTERIOLOGY 419 



Orla-Jensen himself does not include this genus in his formal classi- 

 fication. It is probably invalid as no species is designated. 



Peritricha. The fourth group of the Gymnohaderia named by 

 Messea (1891, p. 232) to contain bacteria with flagella on all sides. 



Peritrichinales. Orla-Jensen (1921, p. 270) suggests splitting 

 Eubacteriales (Buchanan) into Pseudomonadales and Peritrichinales. 

 This latter is the equivalent of his previously used Peritrichinae (q.v.). 

 He includes the following genera: 1. Thermohaderium, 2. Strepto- 

 baderium, 3. Streptococcus, 4. Betabacterium, 5. Betacoccus, 6. Pro- 

 pionihacteriwn, 7. Microbacterium, 8. Tetracoccus, 9. Coccus, 10. Bac- 

 terium, 11. Bacillus, 12. Clostridium. 



Peritrichinae. An order named by Orla-Jensen (1909, p. 328) to 

 include those bacteria with spherical or rod-shaped, never spiral, cells 

 which, when motile, have peritrichous flagella. The group as a whole 

 is not typically made up of water bacteria. The organisms of this 

 group do not secure their growth energy solely by oxidative processes. 

 The other of the two orders into which the Schizomycefes is divided is 

 Cephalotrichinae (q.v.). 



The order Peritrichinae includes the following families: Acido- 

 hacteriaceae, Alkalibacteriaceae, Butyribacteriaceae and Putribaderia- 

 ceae. 



Perroncitoa. This genus of cocci was named by Trevisan (1889, p. 

 29), with the description "Cocchi compressi seriati lateralmente a 

 due a due (diplococchi transversaU) in filamenti semplici rivestiti di 

 vagine ciHndriche membranaceo-gelatinose. Spore macrosome pro- 

 venienti nei filamenti. La forma compressa dei cocchi, appaiata a 

 guisa delle Neisserie, e affato speciale. Quando si liberano dalla 

 vagina divengono perfettemente globulosi." The single species listed 

 is Perroncitoa scarlatinosa (Micrococcus scarlatinosus , Trevisan). The 

 diagnosis is given as follows by De Toni and Trevisan (1889, p. 1053). 



Cocci compressi, lateraliter duo per duos seriati (diplococci transversales) 

 in filamenta simplicia, vaginis cylindricis membranaceo gelatinosis obducta 

 concatenati. Arthrosporae macrosomae in filamentis obvenientes. Cocci e 

 vagina liberati exacte globulosi fiunt. 



One species is included, Perroncitoa scarlatinosa Trevisan, the Strep- 

 tococcus rubiginosus Edington (1887, p. 1262). 



This genus is undoubtedly founded upon a misconception of mor- 

 phology. It has never been used by other authors. It is rejected by 

 Erwin F. Smith (1905, p. 162). It may be regarded as invalid, or at 

 least based upon an unidentified organism. 



