testaceous,
a. [L.
testaceus, fr.
testa a shell. See
Testa.].
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Of or pertaining to shells; consisted of a hard shell, or having a hard shell. [1913 Webster]
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Having a dull red brick color or a brownish yellow color. [1913 Webster]
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.