i6 



MORPHOLOGY 



tions at right angles in one plane, the resultant is a mass 

 usually irregular because reproduction (fission) does not take 



place in every coccus at 

 the same interval. Bacteria 

 (cocci) which reproduce in 

 this way are called micrococci 

 (Ex. Micrococcus pyogenes 

 var. aureus). If, by reason 

 of the gelatinous envelope 

 which often surrounds bac- 



FIG. 5. Streptococcus pyogenes. After teria, the clump of COCCi of 

 Schmidt and Weis. . . . v i j . 



a certain species are held to- 

 gether, they are called staphylococci (Fig. 6) . The mass formed 

 is not unlike a bunch of grapes. If a species exhibits a tend- 

 ency for two cocci to stick together, the term _$_ 



diploccoci (Fig. 7) is applied ; and if groups of * jj 



^^g^ 



four cocci or multiples of four occur together, $ ^ 



tt 



the term tetracocci is used. w* i 

 This formation is also known p IG . 5. Staphy- 

 as merismapedia (Fig. 8). lococci ' 



The coccus may reproduce in three different 

 diameters, all at right angles to each other 



FIG. 7. Dipiococci anc j m two different planes, and as a result, 



(M . gonorrhoeae) . 



After Schmidt providing division takes place at equal in- 

 tervals, a cube will be formed. Bacteria 

 (cocci) reproducing in this characteristic fashion are known 

 as sarcina (Ex. Sar. aurantiaca) (Fig. 9). The size of the 



