Blue skate Sac?

[Rheghead]

Does anyone know what species of shark does this belong to? It is compared to a standard size tennis ball. I thought most dogfish sacs are just a few inches long?

http://i48.photobucket.com/albums/f244/Rheghead/unknowns/Screenshot2014-10-23232332_zps3f24b7db.png

[Rheghead]

Mystery solved. It looks like a Flapper Skate egg sac. :D

[r.rackstraw]

That is spectacular!
Thanks for sharing.