Harpago chiragra

Japanese: スイジガイ(水字貝) - スイジガイ（英語表記）Harpago chiragra

A snail shell of the family Polytminae (illustration). It is large, with the shell reaching a height of 24 cm and a width of 16 cm. It is named after the six thick, long, horn-like protrusions that form the shape of the character for water. The surface of the shell is yellow with many small brown spots, and there are thick, low ribs with thin ribs between them. The shell opening is pale pink, and the outer lip opens wide and becomes thick on the inside and outside, narrowing the area where the soft body enters and exits, with many wrinkles. In young shells, the shell is thin and does not have the six protrusions, and the shell opening cannot be narrowed, so it looks like a different species. There are shiny ring-shaped eyes at the tips of the antennae on the head of the soft body.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ソデボラ科の巻貝（イラスト）。大型で殻の高さ24cm，幅16cmに達する。6本の太く長い角状の突起が出て，水の字状になるのでこの名がある。殻の表面は黄色の地に褐色の小斑が多く，また太く低い肋とその間に細い肋がある。殻口は淡紅色で，外唇が広く開き内側と外側とが厚くなって，軟体の出入りするところは狭くなり，多くのしわが出る。幼貝では殻は薄く6本の突起はなく，殻口も狭められないので別種のように見える。軟体の頭部の触角の先にはリング状に輝く眼がある。

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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