It is also found on the carapace of crabs and Limulus, and on mollusks.
If Tartlet complains, it is because he does not like mollusks!
The mollusks and echinoderms show the least disposition for it, and the platodes, vermalia, and articulates the most.
Among the mollusks we must note the evolution of the cephalopods.
Then the flat worms and mollusks took to a creeping mode of life, while the annelids and vertebrates still swam.
The reason why some mollusks have thus lost their shells is clear enough.
The ne plus ultra of mollusks to the collector is without doubt the genus Cypraea, comprising the cowry shells.
We shall now turn our attention to the highest order of mollusks—the cephalopods.
The second class embraces the mollusks, or animals inhabiting shells.
A decided tendency to this departure from the type is a feature of the mollusks.
|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.