| photo No 01 | .. | photo No 17 | .. | photo No 43 | .. | photo No 62 |
 | >> |  | >> |  | >> |  |
| photo No 1, 2, 4-16 | .. | photo No 17-31 | .. | photo No 32-47 | .. | photo No 48-62 |
P. caudatum, Strain: 27aG3 x Yt3
Conjugating pair undergoing nuclear exchange and karyogamy; living cells observed by differential-interference-contrast microscopy; by A. Yanagi
photo No 3, 37, 57
P. caudatum, Strain: unknown
Conjugating pair around nuclear exchange; living cells observed by phase-contrast microscopy; by A. Yanagi
photo No 66-67
P. caudatum, Strain: unknown
Conjugating pair around nuclear exchange; living cells observed by differential-interference-contrast microscopy; by A. Yanagi
photo No 68-72
photo No 73-92