from The Century Dictionary.
- In the Echinodermata: A name applied by Roemer to the small elongated side-plates arranged in rows covering the spaces between the edges of the lancet plates and the sides of the radial sinus in the Blastoidea. These are the “ambulacrals” of Bather's terminology.
- In Bather's terminology, the perforated triangular plates adjacent to but distinct from the deltoids in the interambulacra of certain blastoids, especially in the family Asteroblastidæ.
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