Ciliophora 387 



Fig. 7. 32. A-C. Nyctotherus kypliodes Geiman and Wichterman: A. 

 Specimen showing nuclei, karyophore, contractile vacuole, cytoproct; x375. 

 B. Transverse section through peristome and nuclei, x375. C. Ciliated cyto- 

 proct into which the contractile vacuole empties, xl025 approx. (after G. 

 & W.). D. Balantidioides muscicola Penard, about 80/i long (after Kahl). 

 E. Reichenoiuelln nigricans Kahl, specimen 250^ long, showing adoral mem- 

 branelles but no undulating membrane or distinct pharynx (after K.). F- 

 H. Transverse sections of Nyctotherus macropharyyigeus through anterior, 

 middle and posterior regions of the peristome; x240 approx. (after Wetzel). 

 I-K. Paranyctotherus kirbyi (Rodriguez) Sandon: view of left side (I), show- 

 ing endoplasmic fibrils, macronucleus and peristome, xl63; section through 

 peristome (J), schematic; antero-ventral region (K) showing peristomial 

 ciliatiue and endoplasmic fibrils (after S.). L, M. Nyctotherus cordiformis 

 Stein: longitudinal section (L) showing membranelles, undulating membrane, 

 contractile vacuole and macronucleus, x300 (after Villeneuve-Brachon); 

 .schematic sagittal section (M), showing nuclei, karyophore, peristome, and 

 cytostome (after ten Kate). 



