SCUTIBRANCHIATA

Scu`ti*bran`chi*a"ta, n. pl. Etym: [NL. See Scutum, and Branchia.] (Zoöl.)

Definition: An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.

Note: It is now usually regarded as including only the Rhipidoglossa and the Docoglossa. When originally established, it included a heterogenous group of mollusks having shieldlike shells, such as Haliotis, Fissurella, Carinaria, etc.

Source: Webster’s Unabridged Dictionary 1913 Edition