Casemosa (Casemeria verrucosa) - Casemosa (English spelling)

Japanese: カセミミズ(枷蚯蚓) - カセミミズ（英語表記）Epimenia verrucosa

A worm-shaped mollusc of the family Corallidae in the class Aplacophoridae. In Amakusa, they are called Kagaami, which means "snail nets," and so they are named after the way they get caught in these nets. The largest ones are about 30cm long and 1cm wide, but they are usually smaller. They are long and slender but without segments. Their body surface is smooth, but has some warty bumps and yellow, blue, and green spots on a dark brown background, giving them a poisonous appearance. Their mouth is at the front end, and a thin groove runs from front to back on the ventral side, so this species is also known as the Groove-Gastric. It is thought that these grooves are a degenerated form of the wide legs of snail shells.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ミミズのような形をした無板綱サンゴノヒモ科の軟体動物。磯立網(エビ網)を天草で枷網というがそれにかかってくるのでこの名がある。最大のものでは体長30cm，太さ1cmくらいになるが，ふつうはもっと小さい。細長いが節はない。体表は平滑であるが，多少いぼ状の凹凸があり，濃褐色の地に黄色，青色，緑色などの斑紋があって毒々しい。口は前端にあり，腹側を前後に細い溝が走るので，この類を溝腹類ともいう。この溝は巻貝などの広い足が退化したものと考えられている。

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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