The Knobbed whelk is the second largest species of busycon whelk, being able to grow up to 305 millimetres. The shell of the Knobbed whelk is dextral, in other words the shell is right handed. If you held up the shell with the spiral end up and the opening facing you, the opening will be on the right hand side. The Knobbed whelk lives between deep and shallow water depending on the time of year. During Summer and winter they live in the deeper parts of the water, which can be up to 48 meters below the water’s surface. Then during autumn and spring they move to the shallow waters. When they are in the shallow waters they hunt for oysters, clams and other bivalves. When the Knobbed whelk opens the shells to eat its prey, the put the edge of their own shell to wedge open the preys shell and then they use their proboscis to eat their victim.
I got my information from:
http://www.en.wikipedia.org/wiki/Knobbed_whelk
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