Three adult Hynobius nigrescens with malformed legs were found in a sample of 165 specimens collected at Iwamuro-Mura, Niigata Prefecture, on March 7, 1979. In the left hindleg of specimen No. 1 metatarsal 2' arose from the basal part of metatarsal 2 and digit II' grew to the position of the underdeveloped digitus IV. In the right hindleg of specimen No. 2, brachydactylia resulting from poor development of the phalanges was seen. Specimen No. 3 had a foreleg-like dwarfish leg on the abdomen. The osteology of these malformed legs is described, and causative factors of the malformation are discussed.

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In order to determine diagnostic characters which differentiate the Japanese pond frogs, Rana nigromaculata and three forms of R. brevipoda, four characters, each divided into three character states, were chosen according to the shape and distribution of temporal dark spots, and variations in these characters were statistically analysed within and among the four forms. Among the four characters selected, the shape of the dark spot (s) behind the dark band on the supratympanic fold and the distance between these two markings were most stable within forms and most different between nigromaculata and forms of brevipoda, which suggests that they are of value in differentiating these two species.

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1963年6月24日京都市内で捕獲したアオダイショウの雄(No.4076)が1979年8月22日死亡した。飼育期間は16年2ヵ月である。捕獲時の体全長は146cmであった。この体長から捕獲時の年令を推定すると,成長の速い場合は3年10ヵ月,おそい場合は1年又はそれ以上を加えねばならない。するとこの蛇の死亡時の年令は,推定20年又はそれ以上となる。

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