Tidepool Tim says,  “We see lots of these worms when we are digging for sandworms or bloodworms.  They make a tube of fine bits of sand and shells - this typically slides off of the worm when they are picked up.  These worms have a neat tan color and raised red rings or 'glands' gills along each joint.  They are found all over the world and on both coasts of the U.S.  We provide them as a specimen in our annelid worm collections and sometimes sell them as feed for fish.  At times they are very abundant in our sandy mudflats with 3 or 4 worms coming up in each fork-full of sediment that we turn over.”