from The Century Dictionary and Cyclopedia
- 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.
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