EXPLANATION OF PLATES 



PLATE 29 



Fig. 1. Transverse incision through three-fourths of the body, after which 

 the animal maintained normal form. X 800. a.c., anal cirrus; a.c.f., anal cirri 

 fiber; ant. cyt. f., and nib. f., membranelle fiber; c.v., contractile vacuole; cyt., 

 cytostome; f.c., frontal cirri; m.c., marginal cirri; mac., macronucleus; m.f.p., 

 membranelle fiber plate; mic., micronucleus; mot., motorium; o.L, oral lip; ph., 

 pharynx. 



Fig. 2. Transection between ' ' group of three ' ' and ' ' group of four ' ' frontal 

 cirri. Dorsal view. X 800. 



Fig. 3. Transection between "group of four" frontal cirri and the two 

 ventral cirri. X 800. 



Fig. 4. Transection between the two ventral cirri and five anal cirri. 



[462] 



