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The free-swimming, hat-shaped larva of certain nemertean worms. It has no resemblance to its parent, and the young worm develops in its interior.

id fish (Naucrates ductor); -- so named because it is often seen in company with a shark, swimming near a ship, on account of which sailors imagine that it acts as a pilot to the shark. (b) The rudder fish (Seriola zonata). -- Pilot jack, a flag or signal hoisted by a vessel for a pilot. -- Pilot jacket, a pea jacket…

Fig.: That which supports or upholds, as a board does a swimmer. His charity is a better plank than the faith of an intolerant and bitter-minded bigot. Southey.

Any free-swimming gonophore of a hydroid; a hydroid medusa.

The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.

of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.

The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods.

es of the foot are developed in the form of broad, thin, winglike organs, with which they swim at near the surface of the sea.

Swimming by the expansion and contraction, or lunglike movement, of the body, or of the disk, as do the medusæ.

A division of swimming birds which includes the grebes, divers, auks, etc., in which the legs are placed far back.

osoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.

ists of floating timbers fastened together. -- Raft duck. Etym: [The name alludes to its swimming in dense flocks.] (Zoöl.) (a) The bluebill, or greater scaup duck; -- called also flock duck. See Scaup. (b) The redhead. -- Raft port (Naut.), a large, square port in a vessel's side for loading or unloading timber or o…

ing's eye, 'Tis but the pale reflex of Cynthia's brow. Shak. On the depths of death there swims The reflex of a human face. Tennyson.

One of a group of aquatic beetles having tarsi adapted for swimming. See Water beetle.

the very sides of the way . . . there are slow runnels, in which one can see the minnows swimming. Masson.

A genus of transparent, free-swimming marine worms having lateral and caudal fins, and capable of swimming rapidly. It is the type of the class Chætognatha.

To move through or on the water; to swim, as a fish or a water fowl.

A genus of transparent, tubular, free-swimming oceanic tunicates found abundantly in all the warmer latitudes. See Illustration in Appendix.

straca in which each of the thoracic legs has a long fringed upper branch (exopodite) for swimming.

Any swimming amphipod crustacean. Storm scud. See the Note under Cloud.