Swimming bell - Eisho

Japanese: 泳鐘 - えいしょう
Swimming bell - Eisho

...There is a narrow membrane called a margin along the inside of the umbrella, which is a major characteristic of hydromedusa. The tube jellyfish, such as the Portuguese man-of-war (illustration) and the Baren jellyfish, have a float called a swimming bell at the top, and the lower part is made up of polyps with various functions. The 5cm-high tube jellyfish, which grow densely in seawater and can cause damage to fishing nets and various facilities, and the Portuguese man-of-war and the keynote jellyfish, which have strong nematocyst venom, can plague swimmers.

*Some of the terminology explanations that mention "swimming bell" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…傘の内側に沿って縁膜(えんまく)という狭い膜があり,これがヒドロクラゲの大きな特徴になっている。カツオノエボシ(イラスト)やバレンクラゲなどのクダ(管)クラゲ類は,上端に泳鐘(えいしよう)といううきがあり,その下部はいろいろな機能をもったポリプによって構成されている。高さ5cmほどのクダウミヒドラが海水中の漁網や諸施設に密生して害を与えることがあり,またカツオノエボシ,カギノテクラゲなどは強い刺胞毒で水泳している者を悩ます。…

※「泳鐘」について言及している用語解説の一部を掲載しています。

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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