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Fig. 6. Drawings of the photoreceptor cells typical of anoline lizards (see Crescitelli, 1972) showing the associations between cell type, visual pigment and oil droplet classes. The Polychrus marmoratus pattern is like that shown here for the anolids except for the presence of the rod-like cell containing a medium-wavelength-sensitive (MWS) pigment and a colorless oil droplet. LWS, long-wavelength-sensitive cell; SWS, short-wavelength-sensitive cell; UVS, ultraviolet-sensitive cell; C1, C2, G1, G2 and Y are classes of oil droplet.