Abstract
THE arrangement and the structure of the luminous organs of Spinax niger Cloquet have been thoroughly described by Johann.1 Though these organs are present on the upper surface of the head and along the back (being distributed there mainly in association with the slime canals) they are enormously more abundant on the ventral surface of the body, and also on the flanks above the pelvic region, the black pigment, with which they are everywhere associated, forming a characteristic pattern on the skin of the fish.
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