CILIATE PROTOZOA (INFUSORIA) 277 



57 (58) Body purse-shaped Phascolodon Siein. 



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



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



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



Representative species Hcxotricha globosa Conn u)os. 



Fig. 



h. nexotricha globosa. Lateral and end views, cv, contractile 

 vacuole; m, mouth, x 335- (After Conn.) 



.SO 



Oo (87) 



61 (70) 



62 (65) 



63 (64) 



Usually with an undulating membrane or membranes about the mouth 



Mouth always open. . . . Suborder Trichostomma . . 60 



Peristome usually absent; with or without undulating membranes. 61 



Without an undulating membrane; pharynx present 62 



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

 like tuft of cilia 5, 



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

 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 ^m\ev l^?>6. 



Body broadly rounded anteriorly, rounded or truncate posteriorly 

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

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

 curved about it. Length 100 n. Pond water. 



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

 (After Kent.) 



64 (63) With an oblique circle of strong cilia near the anterior end. Body 

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

 canals encircling the body. I\Iouth ver^tral, posterior to 

 the grooves and leading into a short pharynx. 



CalccolHs Diesing. 

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



Color light brown. \'crv similar in movement to i'rocnilrum turbo. 

 Length 80 to 160 ^. Fresh water. 



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

 X 200. {.After Kent.) 



