Sporozoa 283 



Fig. 6. 8. Cephalina: A. Lecythion thalassemae, trophozoite attached to 

 epithelial cell; x380 (after Mackinnon and Ray). B-D. Nirm gracilis, illus- 

 trating changes in form of the protomerite; arms extended (B), x60; partly 

 contracted in young specimen (C), and closed during movement through 

 intestinal debris (D), x400 (after Goodrich). E. Dactylophorus robustus, 

 xl20 approx. (after Leger). F, G. Hentschelia thalassemae, mature form with 

 anterior end embedded in tissue cell (F), x400 approx., and view of anterior 

 end (G), xl030 approx. (after Mackinnon and Ray). H. Pyxinoides puge- 

 tensis (from barnacles), x384 (after Henry). I. Hyalosporina cambolopsime 

 (from millipedes), mature form after losing small tongue-like epimerite; 

 cuticular striations not shown; x90 (after Chakravarty). J. Metamera reyn- 

 oldsi, attached to epithelium; xl40 (after Jones). 



