CONCRETION n. 2 definitions
A mass or nodule of solid matter formed by growing together, by congelation, condensation, coagulation, induration, etc.; a clot; a lump; a calculus. Accidental ossifications or deposits of phosphates of lime in certain organs . . . are called osseous concretions. Dunglison.
CRINOIDEA n.
A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil species, like some that are recent, were attached by a jointed stem. See Blastoidea, Cystoidea, Comatula.