3 6 SPIROCILETES. 



the supporters of longitudinal division to represent 

 the final stage in this process, just before separation of 

 the daughter individuals takes place (Fig. 33). 



Gross believes that spirochaetes become bent upon 

 themselves before undergoing transverse division, the 

 close apposition of the two limbs of the bent organism 



FIG. 35. FIG. 36. FIG. 37. 



FIG. 35. Spirochasta balbianii ; supposed conjugation. (Perrin.) 

 FIG. 36. Spirochaeta vesperuginis; conjugation (?). X22$o. 



(Gonder.) 

 FIG. 37. Spirochaeta anodontae; apparent conjugation, probably 



a stage in longitudinal fission. 



then giving rise to an appearance of longitudinal fission. 

 He terms the process division by "incurvation." 



A development of the spirochaetes into long fila- 

 ments has been described by Duval and Todd in culti- 

 vations of Sp. duttoni, and by Klodnitsky as occurring 

 in Sp. obermeieri within the body of the bug (Fig. 34). 

 Koch also saw filamentary forms in ticks infected with 

 Sp. duttoni. 



