330 BACTERIOLOGY 



SPIRILLACE^: 



Cells more or less spirally curved. Division in one direction of space, at 

 right angles to the longer axis of the cell. Generally without endospores, 

 which are, however, present in a few species. With or without flagella. 

 The flagella, when present, are attached to the poles, usually in bundles. 



I. Cells stiff, not flexile. 



A. Without flagella. SPIROSOMA Migula. 



B. With flagella. 



1. With i, rarely with 2-3 polar flagella. MICROSPIRA Schroter. 



2. With a bundle of polar flagella. SPIRILLUM Ehrenberg. 

 II. Cells flexile. SPIROCH^ETA Ehrenberg. 



SPIROSOMA Migula 



Cells comma-formed to spiral filaments, not flexile, stiff; non-motile, flagella 

 absent ; occur singly or commonly united in zoogloea ; endospores not yet 

 discovered in any of the species. 

 I. Non-chromogenic, without pigment on gelatin or agar. 



A. Gelatin colonies floccose. 



1. Spirosoma linguale (Weibel) Migula. 



B. Gelatin colonies finely granular. 



2. Spirosoma nasale (Weibel) Migula. 



II. Chromogenic, produce pigment on gelatin or agar. 



A. Chromogenic function weak, pale yellows. 



3. Spirosoma flavescens (Weibel). 



4. Spirosoma flava (Weibel) . 



B. Chromogenic function stronger, golden yellows. 



5. Spirosoma aurea (Weibel). 



i. Spirosoma linguale (Weibel) Migula 



Vibrio lingualis Weibel : Centralblatt f. Bakteriol., IV., 1888, 227. 

 Mpma. linguale Migula: Die Natiirlichen Pflanzenfam., 1892, 3. 



Morphology. Bacilli short, curved, cholera-like rods, or slightly undulate 



filaments ; no true spirals. 

 Gelatin colonies. Floccose, anthrax-like. 

 Gelatin stab. In depth, growth filiform ; on the surface, no growth ; gelatin 



not liquefied. 



