schizonemertea

from The Collaborative International Dictionary of English v.0.48

Schizonemertea \Schiz`o*ne*mer"te*a\, n. pl. [NL. See {Schizo-},
   and {Nemertes}.] (Zool.)
   A group of nemerteans comprising those having a deep slit
   along each side of the head. See Illust. in Appendix.
   [1913 Webster]