Strange thing attatched to snail?

[Mp.]

Always a nervous day when i have to post in this thread.. I struggled to get a good photo but its head is slightly wider then the body and it has some hair/spike looking things on its bottom half (bottom half in relation to the photo that is)

 

[Mp.]

Im not sure how to delete post but i am a fool lol.. This is just the moulted leg of one of my shrimps