Shells

 https://www.outerbeaches.com/hatteras-island-seashells

https://www.iloveshelling.com/blog/category/drill/sharp-rib-drill/

http://www.seashells.org/sharkeye.htm

http://www.seashells.org/slippershell.htm

https://www.iloveshelling.com/blog/2011/04/10/the-elite-three-seashells/

http://www.seashells.org/alltheseashells.html

https://www.mitchellspublications.com/guides/shells/articles/pictorial/