2 7 8 



DEAN A. PACK. 



ward from the right anterior end to the left posterior end over 

 the ventral surface. The row fartherest to the left is interrupted 

 one-third of the way back by the peristomial region. This 

 region is bounded on the left by the peristomial membranellas, 



f.ff. 



FIG. i. 



FIG. 2. 



FIG. i. Uroleptus packii. fc, feeling cirri ; frc, frontal cirri; am, adoral mem- 

 branellse; umt, undulating membrane (tongue); urn, undulating membrane; cs, 

 cytostome; cp, cytopharynx; cv, contractile vacuole; ip, Aphanolhece cell; M, 

 macronucleus; fv, food vacuole; EC, ectoplasm; En, endoplasm; vc, ventral cirri; 

 ca, cytopyge. 



FIG. 2. Uroleptus packii. Fc, feeling cirri; cyw, cyst wall. 



which extends backward turning slightly to the right, passing 

 through the mouth, and ending in the cytopharynx. The right 

 side of this region is bounded by a large undulating membrane 

 which extends backward and turns slightly to the left. A 



