Yes , it is mostly covered by hard shell .
Cephalopoda
The defining characteristic of all molluscs is the presence of the mantle. Snails have a mantle, and are thus a mollusc.
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.
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
Mollusca.
invertebrate - has exoskeleton
An invertebrate.
Giant squid is largest known living invertebrate animal on earth .