CILIATE PROTOZOA (INFUSORIA) 

 57 (s8) Body purse-shaped. ... 



277 

 Phascolodon Stein. 



58 (57) Body ovate or nearly spherical in outline with a shght lip at the 



anterior end. Mouth at the base of the lip with no evident 



pharynx. Cilia ventral in six rows. . . Hexotricha Conn. 



Representative species Hexotricha glohosa Conn 1905. 



Fig. 483. 



Hexotricha glohosa. Lateral and end views, cv, contractile 

 vacuole; m, mouth. X 335. (After Conn.) 



59 (4) 



60 (87) 



61 (70) 



62 (65) 



63 (64) 



Usually with an undulating membrane or membranes about the mouth. 

 Mouth always open. . . Suborder Trichostomina . 60 



64 (63) 



Peristome usually absent; with or without undulating membranes. 61 



Without an undulating membrane; pharynx present. . 62 



One or two broad zones of strong ciha about the body; with a tail- 

 hke tuft of cilia. ... 63 



Two broad zones of strong cilia about the body. Body cyhndrical, 

 with mouth posterior leading into a short pharynx. An- 

 terior part of the body uniformly ciliated. A band of 

 strong cilia near the middle and posterior end. 



Urocentrum Nitzsch. 



Representative species Urocentrum turbo Miiller 1786. 



Body broadly rounded anteriorly, rounded or truncate posteriorly. 

 Movement by a rotation on the long axis or swiftly darting from side 

 to side. Contractile vacuole posterior with the band-like nucleus 

 curved about it. Length loo ti. Pond water. 



Fig. 484. Urocentrum turbo, cv, contractile vacuole; », nucleus. X 200. 

 (After Kent.) 



With an oblique circle of strong cilia near the anterior end. Body 

 somewhat pyriform, rigid, finely ciHated. Two groove-like 

 canals encircling the body. Mouth ventral, posterior to 

 the grooves and leading into a short pharynx. 



Calceolus Diesing. 



Representative species. . . Calceolus cypripedium James-Clark 1866. 



Color light brown. Very similar in movement to Urocentrum turbo. 

 Length 80 to 160 ^. Fresh water. 



Fig. 485. Calceolus cypripedium. cv, contractile vacuole; macn, macronucleus. 

 X 2»o. (After Kent.) 



5.CV 



