m. gunnellus
Webster's Dictionary (GCIDE)
Gunnel \Gun"nel\, n. [See Gunwale.]
1.A gunwale. [1913 Webster]
2.(Zool.) A small, eel-shaped, marine fish of the genus Mur[ae]noides; esp., M. gunnellus of Europe and America; -- called also gunnel fish, butterfish, rock eel. [1913 Webster]