Crochet Seashells

I was having fun this week thinking of other fun things to go with the mermaids, and I decided to see if I could crochet some mini seashells.

These are the ones I did...

I forgot to take the picture with something to show scale, but the one to the left is 1 5/8" (4.5 cm) long, and the others to the right are 3/4" (2 cm) wide.

These little shells got me brainstorming all sorts of fun ideas like making a King Triton Throne, and making a coral reef with hyperbolic crochet (which I will give you a sneak peak of what I've done so far on Sunday).

Does anyone know what these kinds of shells are called?  Share with me below...