マルタニシ及びカワニナの異型精子をAcridinorangeで生体螢光処理して, 螢光顕微鏡で観察し, 若干の考察を加えた.何れの異型精子も鏡下で, 構造に一致する美麗な螢光を発して運動する様子が見られた(Pls.25, 26).個々の観察結果は一括して表に示す通りである(Table 1).之等の螢光像は容易且つ速かに得られるので, 螢光顕微鏡法は異型精子の観察に有用な一手段であると考える.

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This paper deals with taxonomic and palaeontological studies of Anadara kakehataensis and its allies. The results are summarized as follows : 1. The specimens described as Anadara kurosedaniensis agree morphologically with the junior form of Anadara kakehataensis, so that the former is regarded as a synonym of the latter. 2. A. kakehataensis is not referable to Anadara but to Scapharca as to its subgenus. 3. Although the junior form of A. daitokudoensis is closely related to that of A. kakehataensis, A. daitokudoensis is distinct from A. kakehataensis in the shape of posterior slope and in the difference of number of rib, as far as the present specimens are concerned. 4. A. kakehataensis and its allies are found always associated with such shells as Vicarya, the dwellers of black mud in embayment under warm current. 5. They are classified into three types : A. daitokudoensis type, medium type (Yatsuo, Ayukawa) aud large type (Tokunari) of A. kakehataensis. Their junior forms have a similar shell to each other. They can be divisible only in adult form. This fact suggests that their form is the best adapted one to individual embayment which has different nutrition owing to it marine conditions.

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