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Yes , it is mostly covered by hard shell .
The defining characteristic of all molluscs is the presence of the mantle. Snails have a mantle, and are thus a mollusc.
Cephalopoda
Mollusks compose of the large phylum of invertebrate animals known as the Mollusca. Mollusks have a mantle, mollusks invertebrate. Arthropods have jointed appendages, arthropods have segmented bodies
Head/Foot - Has sense organs and is used for mobility. Mantle - Covers the body mass and can secrete a shell in some species. Body - Contains the main organs. Located above the head/foot.
They have a mascular foot, a visceral mass, and a mantle.
The foot of the squid is it's tentacles, it enables the squid to move very very very very very very very fast. The foot is also the mantle of the squid (the mantle is a thick layer of tissues {muscle} all mollusks use to protect their guts). In this case the squid uses it's mantle to run away from predators (swim away).
Mollusca.
They would be Mollusks, (phylum Mollusca), a soft-bodied invertebrate with an unsegmented body, one muscular foot for mobility, a visceral hump, and a mantle. Most have shells, but in the case of the slug, which it has no shell. I hope that answered your question. :)
The parts of a snail are its shell, foot, internal organs, head, eyes, and its tentecles
invertebrate - has exoskeleton
An invertebrate.