a. and sb. Zool. [f. prec.: see -ACEAN.]

1

  A.  adj. Of or pertaining to the TESTACEA; shell-bearing; chiefly applied to mollusks.

2

1846.  in Worcester, citing Lyell.

3

1871.  Lyell, Elem. Geol., ix. 119. Value of testacean fossils in classification.

4

  B.  sb. A member of the testacea; a shell-bearing invertebrate, esp. a mollusk.

5

1842.  Brande, Dict. Sc., etc., Testaceans. Testacea.

6

1847.  Webster, Testaceans (Zool.), marine animals covered with shells, especially mollusks; shellfish.

7