656 THE AMERICAN NATURALIST.  [Vow. XXXV. 
paid to them. Finally, however, a particular kind of ciliate 
comes along, Halteria grandinella, which, sailing along with its 
graceful but spasmodic motion, suddenly finds itself on the end 
of one of the long tentacles of Actinobolus. The captive whirls 
7 ty Bf ese X < 3 RA SSS N 
Ti Pye ae RASS 
Fi. 4. — Actinobolus radians St. at rest, with 1 tstretched, waiting for Halterias, 
one of which has been captured. The mouth is on | the eee x 12 
round and round for a brief second or so, and then becomes 
quiet, just as it does when captured in a similar way upon the 
tentacles of a suctorian. The tentacle then begins to shorten 
and as it shortens the victim is drawn towards the capto 
