Snail with rear proboscis?

[syncro]

Just noticed a rear appendage on my snail. Black with mouth. It looks like it was feeding. Rear proboscis or parasite?

http://farm8.staticflickr.com/7034/6729723419_6a3ca09e3c_b.jpg
http://farm8.staticflickr.com/7001/6729723497_67cdc1ed31_b.jpg

[syncro]

It looks like it may be two snails but their shells are fuzed together.

[toytech]

Weird snail parasitic twin thing going on there , sell it to barnem and baileys and make a mint.