TESTACEOUS

testaceous. Testaceous, a. consisting of shells, having hard entire shells as an oyster

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Tes‐ta″ceous (?), a. [[L. testaceus, fr. testa a shell. See Testa.]] 1. 1. Of or pertaining to shells; consisted of a hard shell, or having a hard shell.
2. 2. (Bot. & Zoöl.) Having a dull red brick color or a brownish yellow color.
Testaceous animals (Zoöl.), animals having a firm, calcareous shell, as oysters and clams, thus distinguished from crustaceous animals, whose shells are more thin and soft, and consist of several joints, or articulations, as lobsters and crabs.