Head large, about as wide as deep, usually longer than 1/4 total length of body. Orbit oval, moderate in size. Sensory canals on head spacious. Mouth small, entirely inferior. Teeth conical. Scales nearly hexangular, thin and rather deciduous; spinules weak, slender, in 6-14 divergent rows. A large, naked area present dorsally behind anterolateral margin of snout. Nasal fossa largely naked. Luminous organ long, superficial blackish streak about as long as head exclusive of snout; anterior photophore fossa-like, but scaled (Ref. 54421).