Long (3-4 inches) and whitish colored, the shell is curved in a fashion resembling someones overgrown fingernail. We used to find them along the eastern shore of Florida.
I recently had a reader on my Seashell Identification page ask what it was. She found hers near Panama City. My reference book says that the green jackknife (Solen viridis) is often found in north Florida and has more of a straight edge on one side, and the other type is called the minor jackknife (Enis minor).
- Identifying Similar Small Shells on Sanibel Island (seashellsbymillhill.com)
- Would You Let Someone Use Shells to Massage You? (bellasugar.com)
- The Easiest Way To Shuck Clams (ideasinfood.com)