Channeled Welk

Channeled whelk (Busycotypus canalicutatus), also known as smooth whelk, is one of the largest shellfish. It is similar to the knobbed whelk in shape, but with grooves instead of the knobs along its whorl. The whorl is the spiraled part of the shell when you are looking at it head on.
All whelks are predators and eat all types of clams and bivalves. They typically grow five to eight inches in length. Their range is most of the Atlantic coast from Cape Cod, Massachusetts to northern Florida.
The channeled whelk was made the state shell of Delaware in 2014.
One of their predators is the blue crab, Callinectes sapidus
Channeled and knobbed whelk shells are also used for making wampum by Native Americans.
Whelk is also edible. However recreational harvesting in Delaware is not allowed, except by commercial pots. You cannot just pick one up and take it home. Many collect the shells. In Delaware it is not allowed to take shells off the beaches, but everyone does anyway.
Return of the whelks, we took a couple hundred whelk shells to the beach one day and returned them to the sea. We find more knobbed than smooth whelks after storms washed up on beaches. Probably due to the fact the channeled whelk shells are more fragile and thinner than knobbed whelks.

Commercial Regulations for Whelks in Delaware
State of Delaware TITLE 7 Conservation Shellfish
CHAPTER 28. Conchs (Whelks) Busycon Canaliculatum and B. Carica