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Updated: June 8, 2025
The posterior segment of the body is therefore developed into an operculum-like organ, smooth and of horny texture, which closes the narrow end of the tube. The other extremity is more elaborately guarded, the anterior segment being fringed with a frontal membrane, while the second segment forms a disc, the minute mouth orifice with the true tentacles and gills being debased to the third segment.
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