DESCRIPTION OF SPECIES. 



545 



Clostridium foetidum (Libo- 

 rius). — Bods 1 fi in width, singly and 

 in filaments. Spore-formation re- 

 sembles that o£ 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 Kiilmiana (Eaben- 

 horst). — Cocci, rods, and thread- 

 forms. The cocci are globular, 



Fig. 217. — Cladothkix dichotoma. 



A. Branching sehizomyoete :— (a) Vibrio-form ; (6) Spirillura-form [slightly mag- 

 nified]. 



B. A screw-form with (a) Spirillum-form ; (6) Yibrio-form. 



C. Long spirochseta-form. 



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



E. Screw-forms :— (a) continuous; (6) composed of rods; (c) composed of cocci. 



F. Spiroch^ta-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 oedematis maligni. 



Inoculated in the depth of gela- 

 tine liquefaction spreads from be- 

 low upwards. There is abundant 



1 to 6 ^ in diam. The threads are 

 colourless, 1-5 to 5 ft thick, and club- 

 shaped at the extremity, reaching 

 a diam. of 6 to 9 fi. The threads 

 form colonies with a brick-red,olive- 

 green,or dark-brown to brown-black 



35 



