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4.
attached to its shell. It can be taken out [[strikethrough]] of the shell [[/strikethrough]] and returned again without injury to either. In fact the shell is [[strikethrough]] not a true shell but is [[/strikethrough]] ^[[but]]^ a mere nest or case, in which the female sits and deposits her eggs. [[strikethrough]] The shell ^[[it]]^ is evidently meant for the protection of the eggs. [[/strikethrough]] The animal floats [[strikethrough]] beautifully [[/strikethrough]] ^[[gracefully]]^. The shell sitting in the water [[crossed-out]] [[?]] [[/crossed-out]] in an upright position, keel downward. It does not spread any sail, but uses its arms to