X. 

 NOX-PATHOGENIC SPIRILLA. 



411. SPIRILLUM SPUTIGENUM (Miller). 



Found in the mouths of healthy individuals, especially along the margin 

 of inflamed gums in neglected mouths common. 



Moi'phology. Curved rods which resemble the "commas" of Spirillum 

 choleras Asiaticae ; these are frequently united in S-form or in short, spiral 

 filaments actively motile. 



This spirillum was supposed by Lewis to be identical with Koch's " comma 

 bacillus," but Miller has shown that it differs essentially from this, inasmuch 

 as it fails to grow in the usual culture media. He says : ' 'Although I obtained 

 nearly pure culture material in several cases and used all possible kinds of 

 nutrient media, I did not succeed in producing the slightest growth of this 

 fungus." 



412. SPIRILLUM DENTIUM. 



Synonyms. Spirochaete denticola; Spirochaete dentium. 



Found in the mouths of healthy individuals, ' ' under the margins of the 



Fl - 841 - FIG. 242. FIG. 243. 



FIG. 241. "Spirochsete dentium." x 1,100. (Miller.) 



FIG. 242." Spirochsete plicatilis (6), Vibrio rugula (a), and other bacteria." X 500. (Fluggej 



FIG. 243. "Spirillum dentium." x 500. (Flugge.) 



ms, when they are covered with a dirty deposit and slightly inflamed " 



Morphology. Long, flexible, spiral filaments of unequal thickness and 

 irregular spiral windings; from eight to twenty-five V long. 



Biological Characters. Not known, as all attempts to cultivate this 

 spirillum have been unsuccessful. 



413. SPIRILLUM PLICATILE. 



%no?i2/?n. Spirochaete plicatilis. 



Found in swamp water containing decomposing algae. 



