Noah Webster
Mollusca
MOLLUS'CA, noun [from Latin mollis, soft.] In zoology, a division or class of animals whose bodies are soft, without an internal skeleton, or articulated covering. Some of them breathe by lungs, others by gills; some live on land, others in water. Some of them are naked; others testaceous or provided with shells. Many of them are furnished with feelers or tentacula.