飼育下で生れたハタネズミ15腹69頭を材料として, 乳幼仔期の発育と行動の変化, および生後40週目までの成長を調べた。
出生当日の仔はほとんど全身が裸出するが, 上唇触毛が顕著で, 上唇と頤に細毛が認められる。生後4日目で体上面の毛が生えそろい, 11日目で幼獣の毛衣がほぼ完成する。下門歯は平均4.8日目 (4-6日) , 上門歯は平均5.3日目 (4-9日) で萠出する。耳孔は6～9日目 (平均7.1日) で開き, 開眼は7～9日目, 平均7.9日目に始まる。手の指は平均7.1日目 (7-8日) , 足指は平均8.4日目 (7-9日) に分離を終る。
9日目頃から固形物の摂食をはじめるが, 授乳は14日目または18日目まで続いた。
全長, 尾長, 頭胴長および耳長においては生後3週目までに最も急激な成長が見られ, 後足長では生後2週目までに最も著しく成長する。
雌雄の平均値の差が有意となる (P≦0.05) のは, 体重, 全長, 頭胴長および尾長において生後5週目から.後足長では4週目からであった。耳長と尾率の平均値はふつう雌雄間に有意の差は認められなかった。

抄録全体を表示

Stomachs of wild boars were collected from hunters in Hyogo, Kyoto and Osaka Prefectures from Oct. 1970 to '71. 134 contents were analysed and measured their volumes and weights. Some correlation is seen between the volume of content and the dry weight of stomach, namely body size. In the contents, vegetable items on the foods were found in 90% of the samples. They were chiefly fibrous tissue, subterrenean stems, roots and rhizomes. Acorns were scarcely found. Animal items appeared in 30% of the samples. Identification shows some earthworms, insects, frogs, birds (domestic fowls, probably wasted), and moles. Caloric estimation shows the animal lives under very poor nutritional condition. Even in the sample of the largest content, it provides only 500 kcal, which may be 12 to 15% of the daily need. The damages on agriculture by the animals in these prefectures are caused from this shortage of their foods, in the author's view.

抄録全体を表示

1. 台湾, 西表島と石垣島で1970年7月20日～8月29日にかけて翼手類の採集をおこなった。
2. 採集された翼手類は, 次の4科6種である。
オオコウモリ科 (Family PTEROPODIDAE) : ヤエヤマオオコウモリ (Pteropus dasymallus yayeyamae) , キクガシラコウモリ科 (Family RHINOLOPHIDAE) : タイワンキクガシラコウモリ (Rhinolophus (?) luctres formosae) , ヒナキクガシラコウモリ (Rhinolophus monoceros) .カグラコウモリ科 (Family HIPPOSIDERIDAE) : タイワンカグラコウモリ (Hipposideros arnaiger) , ヒナコウモリ科 (Family VESPERTILIONIDAE) : アブラコウモリ (Pipistrellus abrantus) , ユビナガコウモリ (Miniopterus schreibersi)
3. ヤエヤマオオコウモリの生態的な解明が急がれるものと思う。
4. アブラコウモリ, ユビナガコウモリの2種については, 測定値からみて地域的な変異の面で興味深いものがあり, このことについては今後検討してみたい。

抄録全体を表示

Lutronectes whiteleyi GRAY, 1867, based on two young specimens collected from Hakodate, Hokkaido, Japan, seems to be extinct in the native land, and no specimens have been known in Japan.
While studying the river otter of Japan, the author was attracted his attention by an adult rough skeleton of the subgenus Lutra in the mammal collection of the National Science Museum, Tokyo. Unfortunately the locality of the specimen is uncertain, but there is little doubt that it was collected at the beginning of the Mei ji era, nearly 100 years ago, in the territory of Japan at that time, that is Hondo or Hokkaido. As the specimen is evidently different from the otter of Hondo, the locality is inevitably estimated as Hokkaido.
This estimation coincides with the result of identification of the specimen as Lutra whiteleyi based on strong similarities to OGNEV's adult specimen from Nemuro, Hokkaido, and dissimilarities to the most of the named forms of the subgenus Lutra, in several cranial measurements.
If this identification is correct, whiteleyi seems to be a well established taxon of Lutra lutra group characterized by relatively narrow mastoid breadth and shorter muzzle (Table 6, F and G) .
An opinion that whiteleyi covers whole populations of the Japanese otter, proposed by Pococx (1931), the present author (1949), etc., is not correct. L. whiteleyi must be confined to the Hokkaido population.

抄録全体を表示