from
The Collaborative International Dictionary of English v.0.48
Scutibranchiata \Scu`ti*bran`chi*a"ta\, n. pl. [NL. See
{Scutum}, and {Branchia}.] (Zool.)
An order of gastropod Mollusca having a heart with two
auricles and one ventricle. The shell may be either spiral or
shieldlike.
[1913 Webster]
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.
[1913 Webster]