CERTAIN GENERA OF THE CLOSTRIDIACEAE 9 



DD. Highly proteolytic, blacken meat readily, produce 

 penctratinK foul odor. Form in deep agar 

 large w( oily or spherical colonies or lenticular 

 colonies that show a tendency to become woolly. 

 Are not pathogenic in pure culture. 



Genus 25. Metchnikovillus nov. gen. Type 

 species sporogenes (Bacillus sporogcnes 

 Metchnikoff) as described by the Com- 

 mittee as Metchnikofl's race A (p. 36). 

 CC. Produce balls of amino-acid crystals in meat after a com- 

 paratively short period of incubation. Violently 

 proteolytic, may produce an exotoxin, and invade 

 tissue, which is vigorously digested. 



Genus 26. Weinbergillus nov. gen. Type 

 species hislolyiicus {Bacillus hisiolyticvs 

 Weinberg and Sdguin) as described by 

 Henry, 



DEFINITIONS OF CERTAIN GENERA OF THE CLOSTRIDIOIDEAE' 



Genus 1. Clostridium Prazmowski 1880, emmend. Heller. 



Clostridioideae that do not liquefy gelatin. Most species 

 cause stormy fermentation of milk. Highly saccharolytic, 

 many even splitting pectins. Produce considerable amounts 

 of butyric acid as a split-product of carbohydrate fermentation. 

 May fix nitrogen. Readily derive their nitrogen from inorganic 

 nitrogen salts. Large rods which are frequently polymorphic 

 and form large orgonts and oval spores. Frequently store up 

 starch. Form in deep agar large lenticular or modified lenticu- 

 lar colonies. Common destroyers of plant tissue (not cellulose) 

 in soil. Used in the retting of flax to split pectins. 



Type species, C. amylobader van Tieghem as described by Win- 

 ogradsky (1896). Probable synonyms: Amylohader Trecul, 

 Clostridium butyricum Prazmowski, Amylohakter Gruber, Gran- 

 ulobakter saccharo-hutyricum Beijerinck, B. saccharohutyricns von 

 Klecki, Oranulohacillus saccharobidyricus mobilis nonliquefaciens 

 Grassberger and Schattenfroh, B. amylobacter von Hibler, B. amy- 

 lobacter Arthur IMeyer and Bredemann. Most of these are today 

 incapable of accurate definition and several of them represent 

 groups and not entities. For this reason the type description 

 chosen is that of Winogradsky instead of that of Prazmowski. 



' For definition see Jour Bact., 6, 550. 



