Acera (asera)

[NL., fem. sing. or neut. pl. of Acerus, of opisthobranch i ate gastropods. These bubble-shells have a thin horny shell, flattened and almost inclosed, with a slit at the suture as in the olive-shells; the head is long and without eyes. The genus was instituted in this form by Lamarck, 1818. A. bullata is an example. Originally spelled Akera. O. F. Müller, 1776. 2. Used as a pl. A group of apter Acera bulla ous insects without antennæ. In ta, one of the Bullida . this sense, the word is now a mere synonym of Arachnid a (which see).-3. [Used as a plural.] A group of gastropodous mollusks without tentacles. [Disused.] Aceraceæ (as-e-ra'sē-ē), n. pl . Same as Ace- rineæ. Aceræ (as'e-re), n. pl . [NL., fem. pl.: see Acera .] Same as Acera , 2 and 3.