DESCRIPTION OF SPECIES. 



545 



Clostridium foetidum (Libo- 

 rius). Rods 1 /j, in width, singly and 

 in filaments. Spore-formation re- 

 sembles that of Bacillus butyricus. 

 They are anaerobic. 



Colonies rapidly liquefy gelatine. 



gas-formation with unpleasant smell 

 and splitting up of the jelly. 



They were isolated from earth. 



Crenothrix Kiihniana (Raben- 

 horst). Cocci, rods, and thread- 

 forms. The cocci are globular, 



FIG. 217. CLADOTHRIX DICHOTOMA. 



A. Branching schizomycete : (a) Vibrio-form ; (6) Spirillum-form [slightly mag- 



nified]. 



B. A screw-form with () Spirillum -form ; (b) Vibrio-form. 



C. Long spirochaeta-form. 



I). Fragment with spirillum-form at one end, vibrio-form at the other. 



E. Screw-forms : (a) continuous; (b) composed of rods; (c) composed of cocci. 



F. Spirochseta-form : (a) continuous; (b) composed of long rods; (c) short rods; 



(d) cocci (Zopf). 



On agar the colonies form branch- 

 ing processes resembling colonies of 

 Bacillus cedematis maligni. 



Inoculated in the depth of gela- 

 tine liquefaction spreads from be- 

 low upwards. There is abundant 



1 to 6 n in diam. The threads are 

 colourless, 1*5 to 5 p. thick, and club- 

 shaped at the extremity, reaching 

 a diam. of 6 to 9 p. The threads 

 form colonies with a brick -red, olive- 

 green,or dark-brown to brown- black 



35 



