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Of or pertaining to ambulacra; avenuelike; as, the ambulacral ossicles, plates, spines, and suckers of echinoderms.

Next to the ambulacra; as, the adambulacral ossicles of the starfish.

Away from the ambulacral region.

Of or pertaining to the interambulacra.

s of Echinodermata including the true starfishes. The rays vary in number and always have ambulacral grooves below. The body is starshaped or pentagonal.

plate (Zoöl.), a perforated plate in echinoderms, through which water is admitted to the ambulacral tubes; -- called also madreporic tubercule.

ilar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows.

An order of holothurians, including those that have ambulacral suckers, or feet, and an internal gill.

Sand canal (Zoöl.), a tubular vessel having a calcareous coating, and connecting the oral ambulacral ring with the madreporic tubercle. It appears to be excretory in function. -- Sand cock (Zoöl.), the redshank. [Prov. Eng.] -- Sand collar. (Zoöl.) Same as Sand saucer, below. -- Sand crab. (Zoöl.) (a) The lady crab.…

-- Sucker rod, a pump rod. See under Pump. -- Sucker tube (Zoöl.), one of the external ambulacral tubes of an echinoderm, -- usually terminated by a sucker and used for locomotion. Called also sucker foot. See Spatangoid.

forms a flue. -- Tube coral. (Zoöl.) Same as Tubipore. -- Tube foot (Zoöl.), one of the ambulacral suckers of an echinoderm. -- Tube plate, or Tube sheet (Steam Boilers), a flue plate. See under Flue. -- Tube pouch (Mil.), a pouch containing priming tubes. -- Tube spinner (Zoöl.), any one of various species of spi…