What is this http://airow.com/?viewcontent=81312...

Question

I've draw on it a bit, in red.

I found it at a beach. it's hollow. feel like it's off an animal.

Answer 1

it looks to me like a sack that spiders lay their eggs in.

Answer 2

Don't Have a Clue Sorry :)

x

Answer 3

I think its the skeleton of a sea urchin.

http://uk.images.search.yahoo.com/images...