He couldn't identify it but commenters say it's a Nemertea.    From Wordnik.com.  [Boing Boing] Reference

Yeah ha ha … Nemertea I dissected one of these in my Invertebrate Zoology classes.    From Wordnik.com.  [EXTRALIFE – By Scott Johnson - What the crap is this thing?] Reference

Of the phyla you haven't seen alive, I have seen: Chaetognatha, Nematomorpha, Nemertea, Sipuncula, Echiura which is really a subgroup of Annelida, Phoronida and Brachiopoda.    From Wordnik.com.  [So many phyla so little time] Reference

Long live Linnaeus, Lineus longissimus (Gunnerus, 1770) (Vermes: Nemertea: Anopla: Heteronemertea: Lineidae), the longest animal worldwide and its relatives occurring in The Netherlands.    From Wordnik.com.  [Archive 2008-12-01] Reference

Thus, on the ground of a presumed analogy of certain structures to the vertebrate notochord, several invertebrate groups, as the Enteropneusta, the Rhabdopleura, the Nemertea, were supposed to be, if not ancestral, at least offshoots from the direct line of vertebrate descent.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

Article outlining the biology of the Platyhelminthes and Nemertea.    From Wordnik.com.  [Fishing and Flyfishing with Rangerrob - RSS Feed Available] Reference

Nemertine worms, also known as boot-lace or ribbon worms, belong in their own phylum, the Nemertea.    From Wordnik.com.  [UnderwaterTimes.com News of the Underwater World] Reference

As Nemertine worms, also known as boot-lace or ribbon worms, belong in their own phylum, the Nemertea.    From Wordnik.com.  [WN.com - Articles related to Sundarbans water warming eight times faster than global average] Reference

The world's longest animal may or may not be the nemertean worm Lineus longissimus (ribbon worms; phylum Nemertea), which may or may not have been named after Carl Linnaeus (Carl von Linné).    From Wordnik.com.  [Archive 2008-12-01] Reference

Marine biologists say lost and abandoned lobster, crab and other fish traps plague coastal waters around the globe, putting pressure on a number of already-stressed fish Nemertine worms, also known as boot-lace or ribbon worms, belong in their own phylum, the Nemertea.    From Wordnik.com.  [WN.com - Articles related to Andrew Sharpless: Ocean acidification will cost us dearly] Reference

Nemertea … poisonous.    From Wordnik.com.  [EXTRALIFE – By Scott Johnson - What the crap is this thing?] Reference

Carinoma tremaphoros (Palaeonemertea; Nemertea).    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference

"The Relation of the Nemertea to the.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

Hemichordata, Nematomorpha, Nemertea, Onychophora, Priapulida, Sipuncula, Echiura, Phoronida.    From Wordnik.com.  [SNAIL'S TALES] Reference

Instead, I will list a compilation of some of the phyla of which I have yet to see a live member: Acanthocephala, Chaetognatha, Gnathostomulida, Hemichordata, Nematomorpha, Nemertea, Onychophora, Priapulida, Sipuncula, Echiura, Phoronida, Loricifera, Pogonophora, Brachiopoda, Placozoa and so on.    From Wordnik.com.  [So many phyla so little time] Reference