Abstract
1. In Sciadopitys verticillata the teil division follows the mitosis in the Body cell. The nucleus being situated near the extremity of the cell, the two resulting cells show a remarkable dissimilarity in size and structure.
2. The mitosis to form the neck canal nucleus and the egg nucleus occurs just under the neck cells of the archegonium. The polar view of the spindle clearly shows 10 chromosomes. In the anaphase, the v-shaped chromosomes in the inner pole form a compact group, while those at the outer pole are scattered loosely and lie almost in a plane similar to those in the metaphase. The polar view of the latter enables us to determine easily the exact number of the chromosomes.
3. After fertilization 5 successive nuclear divisions occur and produce 32 free nuclei before the formation of the cell-wall.
In conclusion I wish to express my hearty thanks to Mr. K. OIKAWA for the assistance given me during the course of the present investigation.
