Sulculus diversicolor aquatilis (English spelling)

Japanese: トコブシ(常節) - トコブシ（英語表記）Sulculus diversicolor aquatilis

A gastropod shell of the Haliotidae family (illustration). Originally meaning "lying on the floor," the name is thought to have come from the way it attaches to rocks on the seabed. It also has local names such as anago, nagareko, and nagarami. The shell is 7 cm long, 5 cm wide, and 1.5-2 cm high. It is egg-oval in shape, low and flat. It resembles a juvenile abalone, but can be distinguished by the row of holes along its dorsal edge, which has 6-8 holes compared to 4-5 in abalones, and by the fact that the holes are small and not raised. The coils are small and low, and are located toward the back of the shell, with the last coil being much larger than the others and taking up the majority of the shell.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ミミガイ科の巻貝（イラスト）。もとは床伏しの意で，海底の岩に付着する状態からついた名と思われる。またアナゴ，ナガレコ，ナガラミなどの地方名がある。殻の長さ7cm，幅5cm，高さ1.5～2cm。卵楕円形で低くて平ら。アワビの幼貝に似るが，背側縁に沿ってある穴の列の穴はアワビ類の4～5個に対し6～8個あり，また穴は小さくて盛り上がらない点で区別できる。巻きは小さく低く殻の後方に寄り，最後の巻きがほかに比べはなはだ大きく大部分を占める。

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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