PROTOZOA 9 



strands running from the motorium to sensitive areas, to the 

 membranelles and to the long anal cirri. There are also strands 

 connected with frontal, ventral, and marginal cirri, although these 

 are not connected with the motorium. These cirri are irregular 

 in their movements while the anal cirri are used chiefly in loco- 

 motion. These last as mentioned, have definite connections with 

 the motorium. Yocum traces the homology of the motorium 

 with the blepharoplast of many forms. This is the coordinating 

 structure which serves to regulate anterior and posterior regions 



Fig. 2. Neuromotor systems of Flagellates. Nuclei and neuromotor appa- 

 ratus mostly shown by dark lines or masses. A-D. Origin of ble- 

 pharoplast from the nucleus in Xaegleria. x 1040. E. Flagellate after 

 Robertson, x 1200. F. Trypanoplasma after Martin. G. Trichomitus 

 after Kofoid and Swezy. x 800. H. Cercomonas after Wenyon. I. 

 ChilotnaHti.r after Kofoid and Swezv. x 318.5. J. Trichoni/mpha after 

 K. and S. x 1-50. K. Crithida, after McCulloch. x 1440. L. Leidu- 

 opsis, Kofoid and Swezy. x 200. M. Giardki, Kofoid and Christiansen. 

 x 2.550. 



