Himezobora (Princess Ezo Snail) - Himezobora (English name) Neptunea arthritica

Japanese: ヒメエゾボラ(姫蝦夷法螺) - ヒメエゾボラ（英語表記）Neptunea arthritica

A gastropod shell of the Bucconidae family (illustration). The shell is thick, spindle-shaped, 11 cm high and 7 cm wide, and is sturdy. It has six layers. The first layer is nipple-like, then swells and has a row of knob-like tubercles, which may be barely noticeable in some individuals or may be so prominent that they form fin-like protrusions. The shell color ranges from brown to purple-brown. The body layer is large and rounded. The opening of the shell is wide and oval. The inner surface is purple-brown with thin lines. The water canal groove is short and open. The lid is leathery, thick, and blackish brown. It is found north of Mikawa Bay in Honshu, and is often found on rocky reefs below the intertidal zone.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

エゾバイ科の巻貝（イラスト）。殻の高さ11cm，幅7cm，太い紡錘形で厚くて堅固。巻きは6層。初めの巻きは乳頭状で，その後は膨らみ，瘤状の結節の列があるが，個体によりほとんど明らかでない場合や，著しくてひれ状突起になることもある。殻色は褐色から紫褐色。体層は大きく円く膨らむ。殻口は広く卵形。内面は紫褐色で細いすじがある。水管溝は短く開いている。ふたは革質で厚く黒褐色。本州の三河湾以北に分布し，潮間帯下の岩礁に多い。

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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