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: List of mollusks, Mollusks are soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body. Along with the insects and vertebrates, mollusks are one of the most diverse groups in the animal kingdom, with nearly 100,000 (possibly as many as 150,000) described species. This is a list of notable mollusks, ordered alphabetically by class. Also included are extinct mollusks. (See also index fossil.) class Aplacophora
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.