Referring to a comment by someone earlier in this string, many years ago when we were collecting polychaetes in the Caribbean (Bahamas?), we also looked for a "marine earthworm" that had been reported as living at the water line. Can't remember if we got any or not; if so, they would be at the USNM. Perhaps if Luis would contact Christer Erseus, he may be able to help my fading memory here.