1 0 0 0 寄生性後世動物に對する免疫性の獲得
1 0 0 0 OA 二型精子と營養卵の受精
1 0 0 0 本邦産ゲジムカデ屬の三種
1 0 0 0 OA ヌマガエル(Rana limnocharis)の間性
1 0 0 0 OA 高温飼育せる脳下垂体除去蛙蝌蚪の生殖腺(発生・実験形態)
1 0 0 0 OA 蛙の脳下垂体前葉と性分化との関係(発生学・実験形態学)
1 0 0 0 OA 再びヌマガエルに見出された卵巣睾丸について
Ovotestes found in a female intersex specimen of Rana limnocharis were reported. 1. In both gonads the ovarian tissue is pathological: all ova are degenerating, theca and connective tissue are hypertrophic and fibrous, and the presence of polygonal masses of pigment is remarkable. 2. Islets of testicular tissue are scattered on the surface of both gonads. A testicular nodule lies at the anterior end of the right gonad. Vasa efferentia are not present. The spermatogenesis is normal. 3. Oviducts are well-developed. Seminal vesicles are not present. Secondary male sexual characters such as nuptial color, thumb pads, protruded larynx and vocal sacs are clearly recognized.
1 0 0 0 OA 綜合討論(発生学・実験形態学)
1 0 0 0 OA 甲状腺ホルモンの脳下垂体除去蛙蚪蝌の生殖腺に及ぼす影響(内分泌・生理)
1 0 0 0 OA エストロジェンの日本赤蛙生殖腺分化に及ぼす影響(実験形態・発生)
1 0 0 0 OA 甲状腺ホルモンの蛙幼生の生殖腺に及ぼす影響(実験形態)
1 0 0 0 OA ヌマガエル雄の性分化
More than 1, 500 frogs of Rana limnocharis were collected in Kumamoto district and used for a morphological study on the differentiation of their gonads. Results obtained were as follows: 1) Shortly after metamorphosis the gonads of all young frogs are of ovarian type in external appearance at least. But as they grow older, the gonads in about a half of them become testes, which are distinguishable macroscopically from the ovaries. This sex ratio is established at the end of the first year. 2) Examining the gonads microscopically at the end of metamorphosis, the gonads of the genetic males have a testicular structure, and in about a half of them the oocyte-like cells are present. 3) Although most of the oocyte-like cells degenerate during the first year, some of them remain and continue their growth in the following year. But they seldom attain about 150μ in diameter.