Ciliophora 351 



Fig. 7. 10. AD. Perispira ovum Stein: A. Specimen showing spiral ridge 

 and anterior cytostome; x513 (after Wang and Nie). B. Anterior end of ridge 

 showing the closed cytostome (a slit ending anteriorly in a small pore); 

 schematic (after Dewey and Kidder). C, D. Stages in ingestion of a flagellate; 

 schematic (after Dewey and Kidder). E. Spathidium amphorijorme Greef, 

 IQQfx or smaller (after Kahl). F, G. Spathidioides exsecata Kahl, length about 

 60/i; lateral \iew (F); ventral view (G), showing slit-like cytostome opened 

 inider pressure from a coverslip (after K.). H. Diceras bicornis Kahl, length 

 about 260/^; spiral ridge, posterior contractile vacuole (after K.). I, J. Teuto- 

 plirys trisitica Chatton and de Beauchamp, x250 (after Wenrich): specimen 

 showing proboscidial arms, macronucleus, contractile vacuole, zoochlorellae 

 (indicated along one margin); longitudinal section through cytostome, show- 

 ing circumpharyngeal fibrils and the trichocysts in one arm. 



