Fig. 1. Cone mosaic formations in the light-adapted retina of adult rainbow trout. (A) Square mosaic with corner cones from the centro-dorsal retina, (B) row mosaic from the centro-temporal retina, and (C,D) square mosaic with and without corner cones from the centro-ventral and centro-nasal parts of the retina, respectively. An asterisk indicates a corner cone, a white arrowhead points to the partitioning membrane of a double cone, and `c' refers to a centre cone. (E,F) Square to row mosaics from the proximal (E) and distal (F) dorsal retina. (G,H) Square mosaics with few to no corner cones from the proximal (G) and distal (H) ventral retina. Cones are smaller and more closely packed towards the distal (peripheral) retina. Magnification bar (in A) is 25 µm and relates to all panels.