Avril Bourquin wrote:
> Happy New Year everyone!
>
> I have a gentleman from Florida wondering about sand collars.  I have set up
> a page for him at:
> http://www.manandmollusc.net/Mystery_shell_pages/mystery_shell_steve.html
>
> I told him that they were molluscan egg sand collars; however, I am not
> totally familiar with Florida species so I would appreciate some help.
>
> Steve can be reached at:  [log in to unmask]
> Or if you answer the list, I will forward on all responses to him.

These are very common in southeast Florida, in the sand inside the third
reef at 65 fsw. I always assumed they were Sharkeye (Polinices
duplicatus) eggs, but I have never seen one being made.

"Collectible Florida Shells" by R. Tucker Abbott also ascribes them to
P. duplicatus.

If someone wants to analyze one, I'll be happy to collect it, but I have
never seen one that has obvious eggs.