Tet racer as (tetras eras)

[NL. (Hamilton Smith, 1827), also Tetra ceros, Tet racer us, Tet racer at a (tet-ra-ser'a-tä), n. pl. [NL., pl. of *tet racer as: see Tet racer as.] One of two families of De Blainville's (1825) poly branchiate Paracephalophora, consisting of various genera, not all of which were properly grouped together. They are mostly nudibranchiate or no to branchiate gastropods. The family is contrasted with Dice rata. Also Tetracera.