Leucocephalonemertes
Leucocephalonemertes is a monotypic genus of ribbon worms belonging to the family Lineidae. The only species is Leucocephalonemertes aurantiaca. Etymology 
The genus name, Leucocephalonemertes, comes from the Greek leucos, meaning white, kephalos, meaning head, and Nemertes, from which the phylum name (Nemertea) is also derived. The species epithet, aurantiaca, comes from the modern Latin aurantium, meaning orange. Distribution 
The species is found in Western Europe; specifically, it has been recorded from the UK, Norway, Italy, France, and Cabrera, Spain. Description 
The worms typically grow from  long, and  across. References

Nemerteans