Pen Shells

Pen shells can be very large, up to a foot in length, but most of the ones I have found were broken. Patricia B. Mitchell wrote a nice piece about this shell and has a photo. They can be found in a variety of colors but the striking thing about them is the iridescent quality.
She says that the shell meat is eaten and is similar to a scallop.

Family: Pinnedea
Found: North Carolina, Southern Florida and the West Indies

Florida Lightning Whelk …A “left handed” seashell
Natica Lineata & Babylonia Spirata …One striped, one spotted
Pink Murex
Strawberry Conch
Lettered Olive & Golden Olive
Sand Dollars
Jingle Shells
Jingle Shells- Iridescent
Jujonia -A treasure