Fig. 5. (A) Reflecting stripes of the squid Alloteuthis subulata and Loligo vulgaris. The names are given according to the colour reflected when the stripes are viewed in white light at near-normal incidence (see text for details). (B) Cross section perpendicular to the long axis of a squid’s mantle, in the region of the fins (dotted oval in A). d and v represent dorsal and ventral regions, respectively. For each stripe, solid lines indicate the iridophores. Broken lines, normal incidence to the iridophores; dotted lines, horizontal.