LOCOMOTOR AND PREHENSILE ORGANS 



35 



or there may be as many as five complete turns. The spiral may be com- 

 pared with a portion of a fiat watch-spring, the cytostome being situated 

 at the outer end of the spiral, which lies on the peristome area in front of 

 the cytostome. The cilia composing the spiral generally consist of several 



Fig. 15. — Various Species (jf Suctoria. (After Saville Kent. 1880-1882.) 



(a) Sp^cerophrija magim feeding on ciliates ( x .300). 

 (c) Tokophrijalemnarum {X 100). 



(h) Acinetagmndis (X 100). 

 (d) Discophri/a elongata (X 1.30). 



parallel rows, and those of adjacent rows may unite in such a way as to 

 form a series of spirally arranged, fiat, tongue-like processes or mem- 

 branelles (Fig. 511). Within the cytostome the cilia may fuse to form one 

 or more membranes parallel to the axis of the cytopharynx. The general 



