The Higher Bacteria 



37 



Spirilla. —If a rod-shaped bacterium is spirally twisted and re- 

 sembles a corkscrew, it is called Spirillum. The rigid forms without 

 flagella are known as Spirosoma; rigid forms with flagella, Spirillum 

 and Microspira. 



A spiral organism of ribbon shape is called Spiromonas, while a 

 similar organism of spindle shape is called a Spirulina. One species 

 of spiral bacteria in whose cytoplasm sulphur granules have been 

 detected has been called Ophidiomonas. 







5^§ 





3 4 



Fig. 6. — Various forms of cocci: t, Staphylococci; 2, Streptococci; 3, Diplococci; 



4, Sarcina (KoUe and Wassermann). 



Spiral organisms with undulating membranes are known as 

 Spirochata, but these and the similar genus Treponema are now 

 regarded as more correctly placed among the protozoan organisms. 



THE HIGHER BACTERIA 



The 'Higher Bacteria form a group intermediate between the 

 Schizomycetes, or true bacteria, and the H3rphomycetes, or molds. 

 In the classification of Migula and Chester they include the Myco- 



