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.
There are almost 100,000 species of mollusks around the world, and many tens of thousands more undiscovered. Most mollusk species only live in the ocean, but some live in freshwater or on land. In Michigan there are about 300 species of mollusks known, with more to be found. There are three main groups of mollusks. Snails ( Gastropoda ) are the most diverse group, there are tens of thousands of species.