Abstract
Preliminary studies on the eyes of Anchoa mitchilli and A. hepsetus reveal the existence of cones with a novel arrangement and structure. The cones form parallel rows consisting of alternately placed long cones and short bifid cones. Both types of cones are intimately associated and form triple units regularly spaced along the row of cones. The photoreceptor membrane lamellae (discs) of long and bifid cones differ from those of the normal vertebrate eye in that they lie parallel, rather than transversely, to the long axis of the cell. The lamellae of the long cones are orientated at right angles to those of the bifid cones.
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