32 GENERAL SYSTEMATIC BACTERIOLOGY 



bb. Cells embedded in thick gelatinous masses. 



Ascococcus 

 aa. Consisting of cocci, rods and filaments, or the latter two forms only; in 

 filaments no differentiation of base and tip. 

 b. Spore formation unknown or not occurring. 



c. Cells not spiral Bacterium 



cc. Cells spiral Spirillum 



bb. Spore formation known. 



c. Filaments spiral Vibrio 



cc. Filaments not spiral. 



d. Forming cocci and rods, spore formation in the former. 



Leuconostoc 

 dd. Forming cocci and rods or latter only. Spores in rods or 



cocci Bacillus 



ddd. As in dd, but spores in swollen cells. 



Clostridium 

 3a. Consisting of coccus, rod and filament forms, the latter with a differentiation 

 of base and tip. 

 b. Filaments containing sulphur, sheathless. 



Beggiatoa 

 bb. Filaments without sulphur. 



c. Filaments sheathed Crenothrix 



cc. Filaments not sheathed, cell divisions ultimately both longitudi- 

 nal and transverse Phragmidiothrix 



ccc. Filaments with or without sheaths, no longitudinal cell division. 



Leptothrix 

 4a. Consisting of cocci, rods, filaments and spirals. False branching occurs. 

 Spore formation is unknown Cladothrix 



Trevisan (1885) described several new genera of bacteria, including 

 Kurthia, Zopfiella, Bacteriopsis, Klebsiella and Gaffkya. 



In the same year he also created the genus Pacinia to include or- 

 ganisms of the type of the Asiatic cholera organism. 



Hauser (1885) described a new genus Proteus to include certain put- 

 refactive bacteria which formed characteristic amoeboid colonies on 

 gelatin and which exhibited a high degree of pleomorphism, varying 

 from cocci to rods and spirals. 



Lutz (1886) proposed the generic name Coccothrix to designate the 

 acid fast bacteria of the types of the organisms of tuberculosis and of 

 leprosy. He also made this genus the type of the family Coccothricha- 

 ceen. In the same year Weichselbaum used the designation Diplo' 

 coccus pneumoniae for the causal organism of pneumonia. 



Fliigge (1886) outlined a classification of bacterial genera which 

 has been extensively followed by medical bacteriologists. A key to 

 his genera may be constructed as follows: 



