204 COMMITTEE REPORT 



lius Kendall 1902; Bacterium Ehrenberg emended E. F. Smith 1905; 

 Denitromonas Jensen 1909; Liquidomonas Jensen 1909. 



Characters, those of family. 



Type species, Ps. aeruginosa (Schroeter) Frost? 



Family III. Spirillaceae. Migula 1894, p. 237 



Cells elongate, more or less spirally curved. Cell division 

 always transverse, never longitudinal. Cells non-flexuous. Usu- 

 ally without endospores. As a rule motile by means of polar 

 flagella, sometimes non-motile. Typically water forms, though 

 some species are intestinal parasites. 



Genus 1. Vibrio Mueller 1786, p. 39, emended.. E. F. Smith 1905 



Synonyms: Pacinia Trevisan 1885; Microspira Schroeter 1886; Pseu- 

 dospira De Toni and Trevisan 1889; Liquidovibrio Jensen 1909; Soli- 

 dovibrio Jensen 1909; Photobacteriumf Beijerinck 1889. 



Cells short bent rods, rigid, single or united into spirals. Mo- 

 tile by means of a single (rarely two or three) polar flagellum, 

 which is usually relatively short. Many species liquefy gelatin 

 and are active ammonifiers. Aerobic and anaerobic. No endo- 

 spores. Usually Gram-negative. Water forms, a few parasites. 



The type species is Vibrio comma (Koch 1884) Schroeter 1886. 



Genus 2. Spirillum Ehrenberg 1830, p. 38 emended Migula 



1894, p. 237 



Synonyms: Spirobacillusf Metschnikoff 1889; Spirosoma Migula 

 1894; Sporospirillum? Jensen 1909. 



Cells, rigid rods of various thicknesses, length, and pitch of the 

 spiral, forming either long screws or portions of a turn. Usually 

 motile by means of a tuft of polar flagella (5 to 20) which are 

 mostly half circular, rarely wavy-bent. These flagella occur on 

 one or both poles; their number varies greatly and is difficult to 

 determine; since in stained preparations several are often united 

 into a common strand. Endospore formation has been reported 

 in some species. Habitat: water or putrid infusions. 



Type species Spirillum undula (Mueller 1786) Ehrenberg. 



