FLEXNERELLA 



937 



Classification.— The species belonging to this genus may be divided 

 for purposes of recognition into : — • 



A. Mannitol fermented — Subgenus Flexnerella (Flexner group sensA lato) . 



I. Maltose fermented — Flexner group. 

 II. Maltose not fermented — Pseudodysentery group. 



B. Mannitol not fermented — Subgenus Shigella. 



The forms belonging to these divisions and sections may be re- 

 cognized by the following tables : — • 



Subgenus Flexnerella Castellani and Chalmers, 1918. 



(Mannitol Partial Fermenters.) 

 Flexner Group: Maltose Partial Fermenters. 



Milk. 



Acid then alkaline. 



Sorbitol. 

 I 



No change. 

 Flexneri. 



Alkaline only. 

 FcBcaloides. 



Acid. 

 I 



Salicin. 

 I 



Acid. 



Tangallensis. 



No change. 



DysentevicB. 

 Strong. 



Subgenus Flexnerella Castellani and Chalmers, 1918. 

 (Mannitol Partial Fermenters.) 

 Pseudodysentery Group : Maltose Non-Fermenters. 



Dextrin. 



Acid. 

 Salicin. 



No change. 

 I 



Salicin. 

 I 



Acid. 

 PseiidodysentericB 

 var. Dj. 



No change 

 S. dysenteries Hiss 

 and Russell. 



No change. Acid. 



PseudodysentericB Pseudodysenterics 

 var. Dg. var. A. 



Shiga- Kruse Division: Mannitol not Fermented. 

 Milk. 



Acid then alkaline. 



Arabinose. 

 I 



No change. 

 Dysenteries 

 Shiga-Kruse. 



Acid. 

 Lunavensis. 



Permanently acid. 



Shiga serum agglutination. 



Negative. 

 ParadysentericB. 



