patelloidea

from The Century Dictionary.

• In De Blainville's classification (1825), one of the four families of his monopleurobranchiate Paracephalophora monoica, containing the genera Umbrella, Siphonaria, and Tylodina, having a shell as in Patella, but not including the Patellidæ.
• In Risso's classification, a family typified by the genus Patella.