GNU Collaborative International Dictionary of English

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1.       
   Testaceous , a. [L. testaceus, fr. testa a shell. See Testa.]
   Of or pertaining to shells; consisted of a hard shell, or having a hard shell.
   1913 Webster
   (Bot. & Zool.) Having a dull red brick color or a brownish yellow color.
   1913 Webster
   Testaceous animals (Zool.), 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.
   1913 Webster