A1 Saturday and Sunday, or Friday evening until Sunday night; the part of the week in which many people living in the West do not go to work: This/Next weekend we're going to see some friends. I have a lot of homework to do over the weekend. He spent the weekend fishing with his brother.
List of mollusks. 1  class Aplacophora. 2  clams, mussels, oysters, and scallops (class Bivalvia) 3  octopi, squid, cuttlefish, and nautili (class Cephalopoda) 4  snails and slugs (class Gastropoda) 5  class Monoplacophora. 6  class Polyplacophora. 7  class Scaphopoda. 8  extinct mollusks.
Gastropods are the most diverse family of mollusks, including over 60,000 species of snails and slugs that live in marine, freshwater, and terrestrial habitats. Cephalopods, the most advanced mollusks, include octopuses, squids, cuttlefish and nautiluses. Most of the members of this group either lack shells, or have small internal shells.