well i'm not sure about the first, but it looks like the same type as the second...which is definately an astrea snail. I've got about 60 or so of them and they all had those when i first got them...but i dont notice them too much anymore so i dont think they've got em. As to what it is, i really have no clue, but its not harmull and i guess its just a normal part..on young ones or something lol.
