From the source article at Invertebrates of the Salish Sea": The following set of photos showing Paranemertes peregrina attacking a Nereid worm in the mid to high rocky intertidal were taken by Rebecca Kordas at Eagle Cove on the SE side of Salt Spring Island, British Columbia on Sept 15, 2009. Rebecca is from the zoology dept at the University of British Columbia. Salt Spring Island is SE of Vancouver Island. When Rebecca first encountered the pair, the nemertean had already extended its proboscis and contacted the nereid worm as seen above. The nereid was struggling and trying to crawl away into a nearby crack, pulling on the nemertean's proboscis. The proboscis was not wrapped around the nereid's body but it appeared to be sticking to it. After the nereid thrashed back and forth some more it managed to shake off the nemertean's proboscis, which was slowly drawn back inside the nemertean. The nereid's body, meanwhile, appeared damaged and flattened in the region where it had been contacted by the proboscis, but eventually it crawled away.