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.
The phylum is divided into three diverse classes. 1  Gastropoda: most members of this class have a one-piece, external shell. Gastropods include snails and slugs. 2  Bivalvia: members have an external shell divided into two halves that are connected by a hinge. Bivalves include clams, oysters, and scallops.