CERTAIN GENERA OF THE CLOSTRIDIACEAE 13 



cellulose splitters which require some organic nitrogen for their 

 metabolism. 



Choukevitch (1911) describes under the name B. gazogenes 

 an organism of active growth habit and of very strong fermenta- 

 tive powers, that splits starch and homicellulose. Its morphol- 

 ogy is sunilar to that of Omeliansky's organisms and it may be 

 included in this genus. 



Choukevitch (1913) considers his type 1 of B. Rodella III 

 as similar to 0. methanicus and type II as similar to 0. hydro- 

 genicus, but his reasons for so doing are not very sound. These 

 two organisms do not split cellulose. 



Genus 3. Macintoshillus nov. gen. 



Clostridioideae that do not liquefy gelatin. They produce 

 acid and gas and no putrefaction in meat media. They do not 

 readily attack milk and thej^ ferment few or no sugars. Gram- 

 negative rods with parallel sides and with terminal spherical 

 spores. Colonies in deep agar are small and irregular but not 

 woolly. Frequently found in wounds. Apparently incapable 

 of invading tissue. 



Type species tetanomorphus (pseudotetanus bacillus, Mcintosh 

 (p. 32), Bacillus tetanomorphus Committee (p. 41)), as described by 

 the Coimiiittee. Glucose and maltose are fermented. 



Bacillus tetanoides A of Adamson (1919) is to be assigned to 

 this group. Acid and no gas is produced from glucose and 

 maltose by the majority of Adamson's strains, while one strain 

 showed no fermentative abihty. The former type is probably 

 identical with ^Iclntosh's organism. 



Choukevitch (1913) describes as type 1 of the bacillus known 

 as Rodella III a slender and highly saccharolytic organism with 

 spherical spores, resembling morphologically Omeliansky's cel- 

 lulose fermenters. It does not ferment cellulose nor liquefy 

 gelatin and may temporarily be placed here in spite of the fact 

 that it is said to produce hydrogen sulfide. If the organism 

 does not Uquefy gelatin it is unlikely that it produces any 

 considerable amount of hydrogen sulfide from protein when in 

 pure culture. This organism is a coimnon intestinal sapro- 



