54 R. E. BUCHANAN 



Genus 6. Proteus Hauser, 1885, p. 1 



Synonyms : 



Liquidobacterium Jensen, 1909a, p. 337 

 Spirulina Hueppe, 1886, p. 146 

 not Spirulina, Turpin, 1827 



Short rods, showing great variation in morphology, filamentous 

 and bent rods as involution forms frequent. Motile by means of 

 peritrichous flagella. The species commonly produce motile 

 "islands" on the surface of moist solid media. No spores. Gram- 

 negative. Usually liquefying gelatin rapidly in absence of car- 

 bohydrates. Usually producing acid and gas from certain car- 

 bohydrates. In general the species are closely associated with 

 decay and putrefaction, sometimes pathogenic. 



The type species is Proteus vulgaris Hauser. 



Genus 7. Pfeifferella gen. nov. 



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. 



Genus 8. Lactobacillus Beijerinck, 1901, p. 214 



Synonyms : 



Lactobacter Beijerinck 



Brachybacterium Troili Petersson, 1903, p. 138 in part 



Caseobacterium Jensen, 1909a, p. 478 



Dispora? Kern, 1882a, p. 135 



Tyrothrix? Duclaux, 1882, in part 



Rod-shaped organisms, cells frequently quite elongate, non- 

 motile, without spores. Gram-positive in young cultures. Produce 

 acid, largely lactic, frorn carbohydrates. When gas is produced, 

 it is COi without hydrogen. For the most part the organisms are 

 thermophilic. ' Microaerophilic. 



The type species is Lactobacillus caucasicus (Kern) Beijerinck. 



