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.
clams, mussels, oysters, and scallops (class Bivalvia) 1  ark shell (family Arcidae) 2  cockles (family Cardiidae) 3  coquina clam (genus Donax) 4  gaper clams (Tresus nuttallii and Tresus capax) 5  geoduck (Panopea generosa) 6  jingle shells (family Anomiidae) 7  mussels (families Mytilidae and Unionidae) zebra mussel (genus Dreissena) 8  genus Nuculana.
For most mollusk, their shell is external including snails, scallops, oysters, clams and mussels. For other mollusk, like squid, and cuttlefish, they have a internal skeleton similarly to a shell. There are also some that do not have a shell at all, like octopus and slugs, with only a mantle for protection of organs.ollusks have a body without a cavity, has more than two layers of cell layers, tissues and organs. Mollusks are soft bodied animals with three main regions: head, visceral mass, and foot. The head of the mollusk contains the sense organs such as the brain. It has a pair of eyes, a mouth, sensory and nervous structures.