I have pulled 2 of these out of my tank so far not sure what they are they are milky white and get darker as it goes towards the head.
http://s1113.photobucket.com/albums...iew¤t=923d14fa.jpg&evt=user_media_share
http://s1113.photobucket.com/albums...iew¤t=923d14fa.jpg&evt=user_media_share