With the R-banding (RBA) technique13) improved for the genus Hynobius (RBG), 11) R-banding patterns in Hynobius lichenatus and H. tokyoensis were obtained. The former species was collected in Inawashiro (Fukushima) and Shiobara (Tochigi), and the latter was collected in Isumi (Chiba) and Utsunomiya (Tochigi) in Japan. According to the R-banding patterns, three chromosome variations in H. lichenatus and one chromosome variation in H. tokyoensis were detected. It is considered that these variations show the inter-populational relationships in each species.
A transplantable myeloproliferative disorder, L-8313, is found in the irradiated C3H/He male mouse. The chromosome analysis reveals that dominantly proliferating cells in the mouse with L-8313 are normal cells. The involvement of virus in the passage is denied by virus detection tests. It is suggested that L-8313 is a new myeloproliferative disorder where most of the increased cells are normal cells stimulated by the malignant T cells.
A Xenicotela pardalina male of the Cerambycidae (Coleoptera) has been found to contain both non-B- and B-carrying germ cells, showing an overwhelming preponderance of the B-carrying ones. One to six Bs are observed in the examined spermatogonia and one to five Bs in about 94.2% of the examined MI-cells. The behavior of the Bs at MI is varied as shown in Table I and the association of a pair of Bs (BII) and the incorporation of an Xyp with a B (XyBp) are especially noted, but the B did not associate with any of the regular autosomal bivalents.