Fig. 16. A composite drawing from three median sagittal sections of 

 Epidinium ecaudatum, fixed in Zenker and stained with Mallory's connec- 

 tive tissue stain, X1200 (Sharp), am, adoral membranellae; c, cytostome; 

 cp, cytopharynx; cpg, cytopyge; cpr, circumpharyngeal ring; dd, dorsal 

 disk; dm, dorsal membrane; ec, ectoplasm; en, endoplasm; m, motorium; 

 oc, oral cilia; od, oral disk; oef, oesophageal fibers; of, opercular fibers; 

 p, pellicle; prs, pharyngeal retractor strands; si, skeletal laminae; vs, ven- 

 tral skeletal area. 



