“…Amongst mammals midget bipolars have only been clearly observed in primates (Polyak,'41 ). Rod bipolars and what seemingly could have been flat bipolars, have often been described using light microscopy in non-simian mammals (Cajal, 1892;Kallius, 1894;Kolmer, '36;Polyak, '57;Rohen, '64;Brown and Major, '66;Raviola and Raviola, '67; Shkolnik-Yarros, '68; Stell, '72) but we could identify no bipolar cells in these papers, or in the literature listed in them, that were obvious candidates to fill the central elements of the cone triads. Indeed most of the cells described resembled what we then thought might be flat bipolars.…”