FORM AND STRUCTURE OF BACTERIA 



FIG. 8. Merismopedia (Planococcus littoralis). After 



members of the genus known as the cocci varies from 0.15 

 micron to 2 microns in diameter. Micrococcus progrediens 

 (Schroter) is said 

 to be as small as 

 0.15 micron in 

 diameter. Cocci 

 do not produce 

 spores. A few 

 species of cocci are 

 motile and possess 

 flagella (Ex. Mi- 

 crococcus agilis). 

 Bacilli. If we 



Conceive of a COC- Schmidt and Weis. 



cus becoming elongated so that one axis is of greater length 

 than the other, there results a cylindrical rod. To bacteria of 

 this type the term bacillus is applied. According to Migula's 

 & classification, the term bacillus means a 



definite, motile, spore-producing, rod- 

 shaped bacterium. We apply the term 

 here, however, in its general sense to all 

 rod-shaped bacteria. Bacilli may possess 

 rounded ends (B. subtilis) (Fig. 10) or 



FIG 9-Sardna ven- re ends (g t ant hracis) (Fig. II). 



tncli. After Schmidt 



and Weis. The members of this form type vary 



greatly in length. The length varies from i to 80 microns, and 

 the width from o.i to 6 microns (see infra, Size). Spores may 

 c 



