Polychaete: Family Chaetopteridae, probably Spiochaetopterus sp. A. The smooth soft nature of the 2 tentacles & the clear, annulated "parchment" (actually solidified mucus) tube are the key features. It used to be identified as Spiochaetopterus costarum which was described from the Gulf of Naples. The Lamb & Hanby book probably have it as S. costarum. Years ago I took a close look at the anatomy of our local animal & compared it to good descriptions of European material. It was clear that our wee beastie was not the same thing. Since then I've called it sp. A.
ID and explanation thanks to Leslie Harris
Catalina Island, California USA
![Polychaete Phyllodoce cf groenlandica or Phyllodoce medipapillata<br />
ID thanks to Leslie Harris - "These are the two biggest species of Phyllodoce on this [SoCal] coast. Most polychaetes do have legs which are collectively called parapodia (or parapodium for just one). The setae (= bristles) emerge from the parapodia which sometimes have upper & lower flaps of skin called the dorsal and ventral cirri. What you called legs Kev, are enlarged dorsal cirri. These help the worm move and give the family it's common name - the paddle worms."<br />
Catalina Island, California USA](https://photos.smugmug.com/NorthAmerica/Invertebrates-Eastern-Pacific/Invertebrates-Annedlida/i-N2BPChG/1/4c2d302f/Ti/Worm_090626b_w-Ti.jpg)
