The Collaborative International Dictionary of English v.0.48:

Lernaea \Ler*n[ae]"a\ (l[~e]r*n[=e]"[.a]), n. [NL., fr. L.
   Lernaeus Lern[ae]an, fr. Lerna, Gr. Le`rnh, a forest and
   marsh near Argos, the mythological abode of the hydra.]
   (Zool.)
   A Linn[ae]an genus of parasitic Entomostraca, -- the same as
   the family Lern[ae]id[ae].
   [1913 Webster]

   Note: The genus is restricted by modern Zoologists to a
         limited number of species similar to Lern[ae]a
         branchialis found on the gills of the cod.
         [1913 Webster]