Kumasakagai (Kumasakagai) - Carrier shell

Japanese: クマサカガイ(熊坂貝) - クマサカガイ（英語表記）carrier shell

A gastropod of the family Polytminae (illustration). The shell is cone-shaped, up to 4cm high and 7cm wide, with a flat base and a wide, slightly concave shape. Shells and pebbles are attached to the top of the shell to reinforce it, but depending on the conditions of the seabed, there are cases where more shells are attached or more stones are attached, and the former are sometimes jokingly called "conchologists" and the latter "geologists." When attaching bivalves, the inside is always facing up, and in the case of long, thin gastropods, the thin end is usually attached first.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

クマサカガイ科の巻貝（イラスト）。殻は高さ4cm，太さ7cmに達し，円錐形で底面は平らで広くややくぼむ。殻の上に貝殻や小石を付着させ貝殻を補強しているが，すんでいる海底の状況で貝殻を多くつける場合と石を多くつける場合とがあり，戯れに前者を〈conchologist貝類学者〉，後者を〈geologist地質学者〉ということがある。二枚貝を付着するときは必ず内側を上にしており，また細長い巻貝の場合は通常細いほうから付着させる。

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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