Sea mushroom (Barnea dilatata) (= Barnea japonica)

Japanese: ウミタケガイ(海茸貝) - ウミタケガイ（英語表記）Barnea dilatata(＝Barnea japonica)

A delicious bivalve mollusks of the family Psammidae, a specialty of the Ariake Sea (illustration). The shell is egg-cylindrical, measuring 8 cm long, 5 cm high, and 4 cm in bulge. It is pale white and covered with a pale yellow skin. The front and back ends of both shells are wide apart, and the edge of the front end is everted with a willow-leaf-shaped lime plate on top. Radiating ribs extend from the apex of the shell's surface, and spines are formed where these and growth veins intersect, with the spines being stronger towards the front. The moth moves this to dig into the mud. Two water tubes join at the rear end to form a thick, long tube that is enclosed in a blackish sheath.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

有明海名産の美味なニオガイ科の二枚貝（イラスト）。殻は卵円筒形で長さ8cm，高さ5cm，膨らみ4cmになる。薄質白色で，薄い黄色の皮をかむる。両殻の前後端は広く開き，前端の縁は反転してその上に柳葉形の石灰板がのり，殻表には殻頂から放射肋が出，それと成長脈が交わってとげができるが，前方ほど強い。これを動かして泥を掘る。後端からは2本の水管がくっついて，太くて長い管となり，黒みがかった鞘で包まれている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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