The head of the animal bears numerous simple tapered arms, or tentacles, arranged in groups, but not furnished with suckers. The siphon, unlike, that of ordinary cephalopods, is not a closed tube, and is not used as a locomotive organ, but merely serves to conduct water to and from the gill cavity, which contains two pairs of gills. The animal occupies only the outer chamber of the shell; the others are filled with gas. It creeps over the bottom of the sea, not coming to the surface to swim or sail, as was formerly imagined.
2. The argonaut; -- also called
paper nautilus. See Argonauta, and
Paper nautilus, under Paper.
3. A variety of diving bell, the lateral as well as vertical motions of which are controlled, by the occupants.
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