Abstract
1. 1. The central retina of Squalus, studied by light and electron microscopy, contains about one cone per fifty rods. 2. 2. Squalus' rods and cones resemble their teleostean and mammalian counterparts in most respects. In Squalus, however, rod and cone synaptic endings are somewhat similar, being large pedicles with fine telodendria. 3. 3. Horizontal cell processes contact rod pedicles lateral to presynaptic lamellae (ribbons). Nearby, a small aggregate of dense extracellular material is interposed between the pedicle and each horizontal cell process. 4. 4. Other processes, probably bipolar cell dendrites, make contacts characterized by periodic intercellular substance (basal junctions) with photoreceptor terminals. 5. 5. The presence of cones is probably related to the animal's free-swimming, predatory behavior.
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