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Sea urchins and sand dollars
Answer for the clue "Sea urchins and sand dollars ", 10 letters:
echinoidea
Word definitions for echinoidea in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Echinoidea \Ech`i*noi"de*a\, n. pl. [NL. See Echinus , and -oid .] (Zo["o]l.) The class Echinodermata which includes the sea urchins. They have a calcareous shell, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered ...