414 Ciliophora 



tentacles and the absence of cilia in the mature stage. Even the tentacles 

 are lacking in Endosphaera, which includes endoparasites of certain 

 ciliates. 



Tentacles may be distributed over the surface or they may arise in 



Fig. 7. 50. A, B. Tentacles of Echinophrya horrida, extended and partly 

 retracted; x750 (after Swarczewsky). C, D. Tentacles of Tokophrya lemnarum, 

 extended, and during feeding; x2000 approx. (after Noble). E. Tentacle of 

 Discoplirya piscijormis: c, internal canal; le, lateral expansions of the pel- 

 licle; p, pellicle; sr, spiral ridge in pellicle; t, tip of tentacle containing pores 

 (?); uc, undulations in wall of the internal canal; diagrammatic (after 

 Dragesco and Guilcher). F. Changes in form observed in tentacles of Sphae- 

 rophrya magna; diagrammatic (after Wang and Nie). G. Attachment of 

 stalk to body in Acineta conimensalis; x495 (after Swarczewsky). H. Dendro- 

 cometes paradoxus feeding on several ciliates; x295 approx. (after Pestel). I. 

 Capture of a hypotrich by Tokophrya lemnarum, x268 approx. (after Noble). 



clusters or from lobes or extensible arms. Two varieties are known. One 

 type is capitate (Fig. 7. 50, CT), ending distally in a flattened or rounded 

 expansion. The other type tapers more or less to a point (Fig. 7. 50, A, 

 B). In at least some species, the tentacles contain an inner tube (Fig, 7. 



