Nemertea - These are elongated, unsegmented, soft-bodied worms found under rocks or buried in the sand and mud of bays and estuaries, eats small invertebrates, comes in many different sizes and colors, they are ciliated externally and secrete a mucus through which they progress, catches prey using a proboscis, which is sticky and is kept inside their mouth.
For other references and photos, please consult the web sites below.
http://phylogeny.arizona.edu/tree/eukaryotes/animals/nemertea/nemertea.html
For more information see