from The Century Dictionary and Cyclopedia
- A family of exocyclic or petalostichous echinoderms, or irregular sea-urchins, known as heart-urchins, having a rounded or oval form, very fine spines, and no fascioles. It includes the subfamilies Echinoneinæ and Nucleolinæ.
- A family of proboscis-bearing pectinibranchiate gastropods, typified by the genus Cassidulus.
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