Heteronereis
Pronunciation : Het`e*ro*ne*re"is
Part of Speech : n.
Etymology : [NL. See Hetero-, and Nereis.] (Zo?l.)
Definition : Defn: A free-swimming, dimorphic, sexual form of certain species of Nereis.
Note: In this state the head and its appendages are changed in form, the eyes become very large; more or less of the parapodia are highly modified by the development of finlike lobes, and branchial lamell?, and their set? become longer and bladelike.
Source : Webster's Unabridged Dictionary, 1913