m 



. Pre-Flage22jae, Stage .-'' 



Di agram of the life-cycle of Herpetomonas muscse-domes- 

 ticse Burnett. Arrangement chiefly after Patton ; figures 

 after Leger, Patton, and Prowazek. I-III. Preflagellate 

 stage. IY-YIII. Flagellate stage: Y. Young flagellate. 

 VI. Flagellate beginning to divide, flagellum having already 

 divided. VII. Advanced stage of division. VIII. Adult 

 flagellate. IX-XI. Post-flagellate stage: IX. Degene- 

 ration of flagellum. Xa. Post-flagellate stage completed by 

 formation of gelatinous covering, containing double row of 

 granular bodies (Prowazek). f.v. Flagellarvacuole. Tf. Kineto- 

 nucleus. s.t. Spiral chromophilous thread, tr. Trophonucleus. 



