Mystery unsegmented worm

[ptychoptera]

Collected with algae covered rock in shallow waters of Hilo, HI. The worm is ca. 20-25mm long, unsegmented and brown in color. I'm thinking either nemertean or nematode. The close-up is of the anterior end. Any ideas?

 

[LeslieH]

Nemertean. Nematodes are much smaller & the common ones are much different in appearance.