MOEPHOLOGY OF BACTERIA. 67 



division, very rarely by longitudinal division. One 

 series of forms develop endogenous, round, permanent 

 spores; in others conidia-like constrictions (arthro- 

 spores) Lave been observed or claimed. Other modes 

 of proliferation are unknown at the present time. 



So far as we know, the schizomycetes occur only in 

 the forms here delineated, and which were first com- 

 pletely named by H. Buchner. 



Forms of Solitary Growth. 



Spherical form (a), not coccus. 



Oval form (6), the long diameter at the most twice 

 as large as the transverse diameter. 



Short rods (c), the long diameter is two to four 

 times the transverse diameter. 



Long rods (d) , the long diameter is four to eight 

 times the transverse diameter. 



Filamentous shape (e). 



Half-screw or comma (/), a very short section of a 

 screw, at the most a half winding. 



Short screw (g) , a short screw winding. 



Long screw or spiral form (h). All screw forms 

 may occur either with steep or flat threads. 



Spindle form (i). 



Oval rods (k) are distinguished from the spindle 

 form by the lesser attenuation of the extremities; 

 from the oval form by their greater length (two to 

 four times the transverse diameter) . 



Club form (I). 



Growth in Groups. 



Double spheres (m), with the separation merely 

 indicated ; roll shape or biscuit shape (n) . 



