The number of genera and species is less than that of the other great classes of molluscs.
There were two ways in which the dye was obtained from the molluscs.
Lingula has not risen since the Silurian epoch, whereas other molluscs may have risen.
Taking them in their zoological order, we will begin with the molluscs.
Its food consists of fish, crabs, molluscs, and aquatic insects.
The dye-producing power is not restricted to the whelks, but is shared by other molluscs.
Most gasteropods which live in water have this; most which live on land (only two exceptions in British molluscs) have not.
It is this winter domicile that is most frequently found in the shells of molluscs.
Turn now to the Bivalves or Lamellibranchiate molluscs, which include the familiar oyster, cockle, and mussel.
These molluscs are found in every sea on the globe, and under all latitudes.
|mollusk or mollusc |
Any of numerous invertebrate animals of the phylum Mollusca, usually living in water and often having a hard outer shell. They have a muscular foot, a well-developed circulatory and nervous system, and often complex eyes. Mollusks include gastropods (snails and shellfish), slugs, octopuses, squids, and the extinct ammonites. Mollusks appear in the fossil record in the early Cambrian Period, but it is not known from what group they evolved.