484 K. RAJ[UNNI MENON. 



/ 



Fig. 5. — Transverse section of Actinotroclia in the collar region. Tlie 

 collar wall is only shown in oulline. 



Fig. 6. — A similar section to sliow the blood-corpuscles in the collar cavity. 



Fig. 7. — Part of a horizontal section of Actinotroclia to show the so-called 

 posterior nephridia. 



Fig. 8. — Part of a sagittal section of Actinotrocha to show the nephridium. 

 The ventral wall of tlie collar and part of the ventral wall of the trunk are 

 drawn. 



