Ciliophora 365 



Fig. 7. 19. A. Oral region of Disematnstoma biltschlii Lauterborn, show- 

 ing striated preoral band; schematic (after Kahl). B. Oral region of Loxo- 

 cephahis colpidiopsis; silver Impregnation, showing basal granules of three 

 adoral membranes in oral pouch; schematic (after Gelei). C. Oral ciliature 

 of Tetrahyruena pyriformis (Ehrbg.) Lwoff; silver impregnation, showing 

 bases of three adoral membranes (solid black) and the paroral membrane; 

 xl25 approx. (after Corliss). D. Oral region of Deltopylum rhabdoides Faure- 

 Fremiet and Miigard, showing tetrahymenal organization; schematic (after 

 F-F. & M.). E. Cross-section through Lembadion bullijiiim at level of cyto- 

 stome, showing broad and narrow membranes (compare with Fig. 7. 18, J); 

 x240 approx. (after Wetzel). F, G. Cross-section of Urocentrum turbo 

 through oral groove (F) and near level of cytostome (G); x460 (after 

 ^V'etzel). H. Storaatogenesis in fission of Tetraliymena pyriformis. differentia- 

 tion of adoral organelles about completed in posterior daughter; schematic 

 (after Corliss). I, J. Espejoia mucicola (Penard), oral regions of microstorae 

 and macrostome forms, showing differences in ciliature; schematic (after 

 Faure-Fremiet and Mugard). K. Oral region of Frontonia leucas, silver im- 

 pregnation; schematic (after Klein). L. Oral region of Frontonia parva 

 (after Klein). 



