Vol. 17 No. 3 (1970-09 issued)
| Effects of Various Chemicals on the Behaviour of Paramecium caudatum (With 7 Text-figures and 2 Tables) | |
| NAKATANI, Isamu | 401-410 |
| Reflex Response to Passive Movement of the Two Adjacent Joints (PD and CP Joints) in the Cheliped of the Crayfish (With 4 Text-figures and 1 Table) | |
| MURAMOTO, Atsuko;SHIMOZAWA, Tateo | 411-421 |
| Effects of the Removal of Pineal Organ and Eyes on the Pigmentary Response in Xenopus laevis (With 5 Text-figures) | |
| WAKAHARA, Masami | 422-431 |
| The Fate of Aggregates formed by Two Species of Hydra (Hydra magnipapillata and Pelmatohydra robusta) (With 2 Text-figures, 3 Tables and 1 Plate) | |
| NODA, Kôichi | 432-439 |
| On the Incompatibility of Two Species of Hydra, Hydra magnipapillata and Pelmatohydra robusta, in a Mixed Culture (With 4 Text-figures) | |
| NODA, Kôichi | 440-445 |
| Preliminary Notes on Thysanoptera in Sapporo and the Vicinity (With 17 Text-figures and 1 Table) | |
| KUDÔ, Iwao | 446-461 |
| Social Pattern of the Japanese Pika, Ochotona hyperborea yesoensis, Preliminary Report (With 4 Text-figures) | |
| KAWAMICHI, Takeo | 462-473 |
| The Biology of a Harpacticoid Copepod, Tigriopus japonicus Mori (With 12 Text-figures, 1 Table and 2 Plates) | |
| ITÔ, Tatsunori | 474-500 |
| Taxonomic Studies on the Genus Lasius in Hokkaido, with Ethological and Ecological Notes (Formicidae, Hymenoptera). : II. The Subgenus Lasius (With 7 Text-figures and 5 Tables) | |
| YAMAUCHI, Katsusuke;HAYASHIDA, Kazuo | 501-519 |
| Nesting Habits of Three Species of Andrena in Hokkaido (Hymenoptera, Apoidea) (With 28 Text-figures and 1 Table) | |
| MATSUMURA, Takeshi | 520-538 |