What did Google say about them? I've seen 2 of a supposedly dangerous worm in my life time. Elderly people I knew told me to kill it immediately but I was too late. I didn't have them at that moment to tell me what in the heck I was seeing. Also I had no clue how to cause it had a shell around it. They told me it was supposed to be extinct but I did see them. How else would I know how to describe them?I had to google to figure out what they were .. named exactly as I described them!
Kill them with salt or vinegar. I'm pretty sure you already know that knowing you but that's what I'm seeing. It seems like when it rains it pours. But the truth is when it rains it pours and then you get a rainbow