Phylum: Nemertea; Ribbon worm
Here are a few Emplectonema gracile or Green Ribbon Worms atop some tiny Acorn Barnacles, found under a rock at low tide. (Leslie, I didn't place them in water because I didn't want to pull on them and hurt them!)
For video: http://youtu.be/D_FGxXmdCN4
This little mass of wriggling green worms may be Emplectonema gracile or Green Ribbon Worms. They were long and thin, and impossible to tell the length of each individual... maybe 8"? I found them under a rock at a minus tide and placed them in a container with water to observe them.
Nemertea is a phylum of invertebrate animals also known as "ribbon worms" or "proboscis worms". Alternative names for the phylum have included Nemertini, Nemertinea and Rhynchocoela. Although most are less than 20 centimetres (7.9 in) long, one specimen has been estimated at 54 metres (177 ft), which would make it the longest animal ever found. Most are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many have patterns of...