530 C. A. LAUBACH, J. L. RICE AND W. W. FORD 



plasm at one or both ends often resembling enlarged subtilis or 

 mesentericus spores. Growth on hard media as soft pultaceous 

 mass with tendency to fold or wrinkle, on fluid media as thick 

 friable scum. 

 Represented by 



Bacillus cereus Frankland. 



Bacillus albolactus Migula. 



Bacillus cereus var. fluorescens nov. var. 



Group VI. Megatherium group 



•Very large actively motile organisms measuring 0.75 to 1.25 

 by 3 to 9 microns. Often in long forms which spread out, lose 

 their cytoplasm and show peculiar aggregations of protoplasm 

 at the periphery. Protoplasm rapidly converted into peculiar 

 globular highly refractile bodies, particularly on glucose agar. 

 Shadow and transparent forms appear early. Spores central, 

 excentric or sub-terminal, oval to cylindrical, measuring usu- 

 ally 0.75 to 1.125 by 1.5 to 2 microns. Spores vary greatly in 

 shape, sometimes round, sometimes rectangular, often reniform. 

 Growth on solid media as thick pultaceous mass, on fluid media 

 as turbidity with little or no scum formation. 

 Represented by 



Bacillus megatherium De Bary. 



Bacillus petasites Gottheil. 



Bacillus ruminatus Gottheil. 



Group VII. Round terminal spored group 



Small actively motile organisms measuring 0.5 to 0.75 by 1.5 

 to 3 microns, often forming long threads in old cultures. Proto- 

 plasm homogeneous. Spores subterminal or terminal, round, 

 thicker than the organisms from which they spring, measuring 

 1 to 1.5 microns in diameter. 

 Represented by 



Bacillus pseudotetanicus (Kruse) Migula. 



(Bacillus pseudotetanicus var, aerobius Kruse.) 

 Bacillus fusiformis Gottheil. 



