SPIROCILETES. 



S. Arabia. Large globular swellings were formed in 

 the bodies of the organisms and fusion seemed to take 

 place between two individuals at these points (Fig. 40) . 



FIG. 41. 



FIG. 40. 



FIG. 40. Arabian spirochaste; conjugation. 

 FIG. 41. Spirochaeta balbianii; encystment. 



(Carter.) 

 (Perrin.) 



The forms depicted are, however, so unlike those seen 

 in any other spirochaetes that it seems possible that 

 Carter was dealing with a spirochsetoid form of some 

 other organism. 



FIG. 42. 



FIG. 43. 



FIG. 44. 



FIG. 45. 



FIG. 42. Spirochaeta anpdontae, rolled up forms. X 500. 



FIG. 43. Spirochaeta spiculifera, rolled up. (Schellack.) 



FIG. 44. Spirochaeta pallida. Depression stage. X2250. 

 (Prowazek.) 



FIG. 45. Resting stage of Spirochaeta buccalis. X2250. 

 (Prowazek.) 



Encystment was believed by Perrin to take place in 

 Sp. balbianii, and he gives illustrations of the movements 

 of the organism in assuming this phase (Fig. 41). The 



